Ferny Grove Weather - Monthly Meteorological Report at Ferny Grove for May 2021

At Ferny Grove in May overnight and daytime temperatures were close to average. Daytime temperatures were the lowest in 6 years. In the Brisbane area most sites observed close to average overnight and daytime temperatures. Rainfall was close to average but was the wettest in 6 years. In the Brisbane area the official sites observed near or above average rainfall totals, with most rainfall occurring in the first half of the month. At Ferny Grove air pressure was below average, mean relative humidity and mean maximum relative humidity was above average, mean minimum relative humidity was below average, mean dew point and mean maximum dew point was above average, mean minimum dew point was below average, wind speed was above average and there were 2 thunderstorms (3 thunder days).

Temperature –near average overnight daytime temperatures

Monthly Mean Daily Minimum Temperature: 12.1 ºC, 0.2 ºC below average and 0.6 ºC lower than same month in 2020. This is the fourth lowest on record for May and the lowest since 11.5 ºC in 2018. The official sites in the Brisbane area observed near average mean minimum temperatures at most of the official sites. These near average temperatures ranged between 0.4 ºC below average at Redcliffe (a mean minimum temperature of 14 ºC) and 0.5 ºC above average at Logan City Treatment Plant (13.1 ºC). Two of the inland sites saw below average mean minimum temperatures that were 0.6 ºC below average at Archerfield (11.3 ºC) and 1.2 ºC below average at Amberley which observed the lowest mean minimum temperature of all the official sites of 8.7 ºC. The highest mean minimum temperature was observed by Cape Moreton Lighthouse that was 16.5 ºC and was equal to the long-term average. The mean minimum temperature observed at Brisbane was 13.9 ºC (0.1 ºC above average).

Monthly Mean Daily Maximum Temperature: 24.2 ºC, equal to the long term average and equal to same month in 2020. This is the equal fourth highest on record for May and the lowest since 24.1 ºC in 2015. Mean maximum temperature were generally close to average as observed by the official sites in the Brisbane area. Two of the official sites however observed temperatures that were 0.6 ºC below average at Beerburrum with a mean maximum temperature of 23.4 ºC and Brisbane (23.9 ºC). Mean maximum temperatures at the remainder of the sites were between 0.3 ºC below average at Brisbane Aero (23.3 ºC) and Logan City Treatment Plant (23.8 ºC) and 0.1 ºC above average at Amberley (24.2 ºC), Archerfield (24.1 ºC) and Cape Moreton Lighthouse (22 ºC). The highest mean maximum temperature observed was 24.2 ºC at Amberley and Beaudesert (equal to the long term average). The lowest mean maximum temperature was 22 ºC at Cape Moreton Lighthouse.

Mean Monthly Temperature: 18.2 ºC, 0.1 ºC below average, 2 ºC lower than the same month in 2020. This is the equal fourth lowest on record for May and the equal lowest since 18.2 ºC in 2015.

Lowest Temperature: 6.1 ºC on 17 May 2021 at 6:25 AM. Same month in 2020 was 11.9 ºC. This is the fifth lowest monthly minimum temperature for May on record, the sixth lowest daily minimum temperature for May and the lowest since 4.4 ºC in 2019 on 31 May at 6:14 AM. Official stations in the Brisbane area observed the lowest temperature of the month at many sites on the 17th and at some sites on the 6th, 20th, and 29th. The lowest was 1.8 ºC at Canungra on the 17th and the highest was 12.2 ºC at Cape Moreton Lighthouse on the 6th. In the Brisbane area the 6th was below average due to a cold burst and the passage of a cold front through the region. In the second half of the month most nights were slightly cool or cool at most locations.

Highest Temperature: 29.3 ºC on 10 May 2021 at 1:21 PM. The same month in 2020 was 28.1 ºC. This is the highest monthly and daily maximum temperature for May on record exceeding the previous record high of 29 ºC in 2016 on 3 May at 3:01 PM. The official sites measured the highest temperature for the month at most sites on the 10th and at some sites on the 4th and 11th. The lowest was 24.6 ºC at Cape Moreton Lighthouse on the 4th and 10th and the highest was 29.2 ºC at Logan City Treatment Plant on the 10th. The highest temperature observed at Brisbane was 28.1 ºC on the 10th. In the Brisbane warm days occurred on most days in the first half of the month.

Lowest Daily Maximum Temperature: 18.2 ºC on 5 May 2021 at 3:43 PM. This is the fifth lowest daily maximum temperature for May on record on monthly basis, the highest since 20.6 ºC in 2019 on 31 May at 2:04 PM, the fourth lowest daily maximum temperature for May and the lowest since 15.6 ºC on 23 May 2020 at 8:55 AM. Same month in 2020 was 15.6 ºC. The official sites measured the coolest day of the month on the 5th at most sites and on the 20th and 30th at some sites. These ranged between 18.2 ºC at Brisbane on the 5th and 22.4 ºC at Point Lookout on the 20th. In the Brisbane area all sites observed a cool day on the 5th with the passage of a cold front that brought a cold burst of southerly winds in the region. From the 6th most days were near or below average.

Highest Daily Minimum Temperature: 17 ºC on 12 May 2021 at 6:46 AM. This is the fifth lowest daily highest minimum temperature on record for May, the equal fourteenth highest daily minimum temperature for May and the highest since 19.4 ºC in 2019 on 4 May at 6:02 AM. Same month in 2020 was 15.6 ºC. In the Brisbane area the warmest nights occurred on the 12th at most sites and on the 1st and 10th at some sites. These ranged between 14.9 ºC at Beaudesert on the 12th and 19.8 ºC at Point Lookout on the 10th. Brisbane observed 17.9 ºC on the 12th. Most nights in the first 13 days of the month were warmer than usual and the remainder of the month saw no warm nights.

Monthly Mean Minimum Grass Temperature: 10 ºC (0.9ºC lower than same month in 2020).

Lowest Daily Minimum Grass Temperature: 4.2 ºC on 17 May 2021 (2.6 ºC lower than same month in 2020). This coincided with the lowest minimum air temperature of 6.1 ºC for the month.

Highest Daily Minimum Daily Grass Temperature: 15.1 ºC on 12 May 2021 (1 ºC higher than same month in 2020). This coincided with the highest minimum air temperature of 17 ºC for the month.

Highest Minimum Grass Temperature Depression: 3.8 ºC on 14 May 2021 with a minimum grass temperature of 8.9 ºC and an air temperature of 12.7 ºC.

Lowest Minimum Grass Temperature Depression: 0.7 ºC on 15 May 2021 with a minimum grass temperature of 8 ºC and an air temperature of 8.7 ºC.

Minimum temperatures in May were above average during most days in the first half of the month before near or below average temperatures during the remainder of the month. The 1st and 2nd were 4 ºC above average, 3 ºC above average on the 3rd and eased to 1 ºC above average on the 4th. The 5th was 3 ºC above average before cooling to 1 ºC below average on the 6th that was followed by warm nights until the 13th. The 7th was 1 ºC above average, 2 ºC above average on the 8th, 3 ºC above average on the 9th, 2 ºC above average on the 10th and 11th, 5 ºC above average on the 12th and 3 ºC above average on the 13th. The 14th was close to average, before cooling to 4 ºC below average on the 15th, 5 ºC below average on the 16th, 6 ºC below average on the 17th and 4 ºC below average on the 18th. A warmer night that was 2 ºC above average followed on the 19th before cooling to 2 ºC below average on the 20th, 3 ºC below average on the 21st before easing to 1 ºC below average on the 22nd and to near average on the 23rd to 25th. The 26th was 2 ºC below average, 1 ºC below average on the 27th. It cooled to 4 ºC below average on the 28th, 5 ºC below average on the 29th, 4 ºC below average on the 30th and eased to 1 ºC below average on the 31st.

May maximum temperatures were above average during most days in the first half of the month and then most days during the rest of the month were near or below average. The 1st was 4 ºC below average, easing to 1 ºC below average on the 2nd and warmed to 2 ºC above average on the 3rd and 4th. The 5th was 6 ºC below average, eased to near average on the 6th before a warm period until the 11th. The 7th was 2 ºC above average, 3 ºC above average on the 8th and 9th, 5 ºC above average on the 10th, 4 ºC above average on the 11th and was 1 ºC above average on the 12th to 15th. On the 16th it cooled to 2 ºC below average, was 1 ºC below average on the 17th and 18th and 2 ºC below average on the 19th. The 20th was near average, 1 ºC below average on the 22nd and near average between the 22nd and 25th. On the 26th it was 2 ºC above average, 1 ºC above average on the 27th before cooling to 2 ºC below average on the 28th, 3 ºC below average on the 29th and was 2 ºC below average on the 30th and 31st.

The mean year to date temperature of 22.6 ºC was 0.2 ºC below average and the lowest for January to May since 22.2 ºC in 2013.

Heatwave Conditions (Maximum temperatures): Nil

MSL pressure – below average air pressure

Monthly Mean Daily Minimum MSL Pressure: 1017 hPa (0.8 hPa lower than same month in 2020). This is the fifth lowest for May and the lowest since 1014.9 hPa in 2016.

Monthly Mean Daily Maximum MSL Pressure: 1021.1 hPa (1 hPa lower than same month in 2020). This is the fourth lowest on record for May and the lowest since 1019.9 hPa in 2016.

Monthly Mean MSL Pressure: 1019.1 hPa (0.4 hPa below average, 0.8 hPa lower than same month in 2020). This is the fourth lowest on record for May and the lowest since 1017.4 hPa in 2016.

Lowest MSL Pressure: 1006.3 hPa on 6 May 2021 at 2:41 PM. The same month in 2020 saw 1008 hPa. This is the fifth lowest monthly minimum air pressure for May, the eighth lowest daily May minimum air pressure and the lowest since 1005.8 hPa in 2016 on 27 May at 2:55 PM.

Highest MSL Pressure: 1027.3 hPa on 19 May 2020 at 9:38 AM. The same month in 2020 saw 1028.1 hPa. This is the second lowest May monthly maximum air pressure on record, the lowest since the current record low of 1026 hPa in 2010 on 2 May at 10:00 AM, the equal twenty-second highest daily May maximum air pressure and the highest since 1028.1 hPa on 18 May 2020 at 9:39 AM.

Note: Air pressure measurements are being closely monitored to maintain its accuracy. Over the month of May, a difference of 0.52 hPa lower compared to the official BoM Brisbane site – No. 040913 was observed which is deemed as not meeting the expected accuracy.

Relative Humidity – above average mean humidity and mean maximum humidity, and below average mean minimum humidity

Monthly Mean Daily Minimum Humidity: 52.8 % (6.3 % higher than same month in 2020 and 0.2 % below average). This is the fifth lowest on record for May and the highest since 56.5 % in 2017.

Monthly Mean Daily Maximum Humidity: 94.6 % (7.9 % higher than same month in 2020 and 5.6 % above average). This is the highest on record for May exceeding the previous record high of 93.6 % in 2012.

Monthly Mean Humidity: 73.7 % (7.1 % higher than same month in 2020 and 2.9 % above average). This is the second highest on record for May and the highest since the current record high of 74.5 % in 2017.

Lowest Humidity: 22 % on 17 May 2021 at 11:12 AM (1 % lower than this month in 2020). This is the second lowest monthly minimum humidity for May on record, the third lowest daily minimum humidity for May and the lowest since the current record low of 11 % in 2019 on 31 May at 2:05 PM.

Highest Humidity: 98 % on 26 May 2021 at 7:21 AM (equal to same month in 2020). This is the equal third highest monthly May maximum humidity on record and the highest since 99% in 2019 on 3 May at 7:34 AM.

Dew point – above average mean and mean maximum dew point and below average mean minimum dew point

Monthly mean daily minimum dew point: 10 ºC (0.1 ºC above average). This is the fifth lowest monthly mean minimum dew point for May on record and the highest since 11.7 ºC in 2017.

Monthly mean daily maximum dew point: 15.9 ºC (1 ºC above average). This is the third highest mean maximum dew point for May and the highest since 16.8 ºC in 2017.

Monthly mean dew point: 12.9 ºC (0.6 ºC above average). This is the fourth highest monthly mean dew point for May and the highest since 14.3 ºC in 2017.

Lowest dew point: -1.3 ºC on 17 May 2021 at 11:12 AM. This is the second lowest monthly minimum dew point for May on record, the third lowest daily dew point for May and the lowest since the current record low of -11.1 ºC in 2019 on 31 May at 2:10 PM.

Highest dew point: 20.6 ºC on 12 May 2021 at 1:35 PM. This is the third highest monthly maximum dew point on record for May, the highest since 21.2 ºC in 2019 on 3 May at 1:14 PM, the equal seventh highest daily dew point for May and the highest since 21 ºC on 4 May 2019 at 11:38 AM.

Wind Speed – above average wind speed

Maximum Wind Gust: 31 km/hr on 12 May 2021 at 4:31 PM. This is the lowest maximum wind gust on record for May on record, exceeding the previous record low of 34.8 km/hr in 2012 on 28 May at 12:15 PM, the equal forty-first highest daily wind gust for May, and the highest since 39 km/hr on 24 May at 12:39 AM.

Maximum Wind Speed: 16 km/hr on 13 May 2021 at 12:14 PM (Light Force Wind). This is the lowest monthly maximum wind speed for May on record exceeding the previous record low of 17.2 km/hr in 2012 on 29 May at 11:50 AM, the fifty-fifth highest daily wind speed for May and the equal highest since 17 km/hr on 2020 on 24 May at 3:41 PM.

Wind Run: 1751 km (1104.8 km lower than same month in 2020), 280.9 km below average and 15.6 % below average. This is the third highest on record for May total wind run and the lowest since 1367.6 km in 2018.

Monthly Mean Wind Speed: 1.2 km/hr (2.7 km/hr lower than this month in 2020), 1.3 km/hr below the long term average). This is the equal second lowest on record for May and the equal lowest since 1.2 km/hr in 2014.

Daily Mean Maximum Wind Gust: 21.6 km/hr (2.8 km/hr lower than this month in 2020), 2.5 km/hr above average and 15.3 % above average. This is the fifth lowest daily mean maximum wind gust on record for May and the lowest since 20.9 km/hr in 2014.

Daily Mean Maximum Wind Speed: 10.6 km/hr, 1.7 km/hr lower than this month in 2020), 3.1 km/hr above average and 42% above average. This is the second lowest on record for May and lowest since the current record low of 8.5 km/hr in 2012.

Dominant Direction: S (S this month last year).

Rainfall – above average rainfall

Monthly Rainfall Total: 99.5 mm (3.5 mm below average) and 96.6% of the long-term average. This total is in decile 4/ 32nd percentile which ranks as average and 52.2 mm above the long-term median (220.4 % of long term median). This total is higher than this month in 2020 which was 12.1 mm, the eighth highest on record for May and the highest since 222.2 mm in 2015.

Long period rainfall totals remained above average for the rainfall periods up to 18 months and improved for some of the longer periods, though 36 monthly rainfall remained significantly below average. 6 monthly rainfall improved by 82.3 mm in April to 154.1 mm above average (decile 9), 9 monthly rainfall improved by 23.8 mm to 110 mm above average (decile 8) and 12 monthly rainfall improved by 88.8 mm to 96.1 mm above average (decile 6). 18 month rainfall improved by 72.6 mm to 165.6 mm above average (decile 8). 24 monthly rainfall returned to being in the positive from 14 mm below average to 9.8 mm above average (decile 5). 36 month was the only period that was below average being 165 mm below average (decile 4) which was the same as the previous month. 48 monthly rainfall slipped slightly from 24.9 mm above average to 2.2 mm above average (decile 6).

The largest positive anomaly that was observed by the 6 month rainfall was the highest since 360.2 mm above average in the 6 months to May 2013. 9 and 12 month rainfall was the highest since 2018 and 18 monthly and greater periods were the highest since 2013 or 2015. Compared with the same period in 2020 the long period rainfall totals improved except for 36 month (which slipping by 38.4 mm). The greatest increase in the long period rainfall anomalies was the 18 month rainfall that increased by 538.8 mm and these increases in the rainfall anomalies improved by at least 100mm.

The official sites in the Brisbane area observed near or above average rainfall totals. Most sites observed totals that ranked as high and some sites observed totals that ranked as near average. The near average totals were 72.6 mm at Beerburrum (61 % of the long term average) and 100.8 mm at Cape Moreton Lighthouse (61 %). The remaining sites that observed totals that ranked as high ranged between 100 % of the long term average at Archerfield with a total of 72 mm and 201 % of the long term average at Redcliffe with a total of 136.2 mm. Brisbane observed a total of 89.8 mm which ranked as high and was 147 % of the long term average. The highest total of all the official sites was 234.3 mm at Caloundra Airport and the highest total of the main official sites was 136.2 mm at Redcliffe.

In the Brisbane area most of the rainfall fell during the first half of the month. In the first three days of the month were showers and thunderstorms from a coastal trough off the south Queensland coast. This brought 3-day rainfall totals of between 20 mm in inner Brisbane city to more than 60 mm at Brisbane Airport. A 3-day rainfall total of 200.8 mm was observed at Caloundra. On the 4th a cold front and trough moved across southern and south-east Queensland that brought showers and thunderstorms and moderate totals over part of the region on the 5th and 6th. Further showers and thunderstorms occurred on the 11th and 12th with the passage of another surface trough. Some locations saw mostly isolated showers with mostly light falls in the second half of the month.

Number of Rain Days (0.1 mm or greater): 7 days, 1 day less than same month in 2020 and equal to the long-term average. This is eighth highest on record for May and is the equal lowest since 7 days in 2018.

Highest Daily Total: 28.6 mm on 13 May 2021. This is the fourteenth highest daily total on record for May on monthly basis, the twenty-seventh highest daily total on record for May on daily basis and the highest since 29.1 mm on 9 May 2018. The highest daily total in the Brisbane area of all official sites was 120 mm at Caloundra Airport on the 1st.

The year to date total rainfall was 748.9 mm (121.1 mm above average and 19.3 % above average) and compared with previous annual totals for the same period is the highest since 944.5 mm in 2019 and the tenth highest on record. This is similar to the same period in 2020, which saw well above average rainfall in January and February becoming below average in April and May. 2021 saw near average rainfall until above average rainfall in March and April 2021.

The year to date number of rain days of 66 was 14 days above the long term average. This is the eighth highest on record as compared with previous January to May totals and the highest since 69 days in 2019.

Monthly Rainfall Total – (automatic gauge) 24 hours to 9am: 90 mm (9.5 mm less than the site official standard gauge and within 9.5%). Highest daily total of automatic gauge, (24 hours to 9am): 21.4 mm on 2 May 2021, (24 hours from midnight): 38.6 mm on 12 May 2021.

Note: This automatic gauge for the month of May, meet the expected accuracy (of +/- 10% of the standard gauge) at -9.5%.

After showers in the last day of the previous month, there were light showers in the first few hours of the day. 7.9 mm was measured on the 1st. A light shower in the late morning on the 1st with some thunder from the edge of showers that passed to the north before moderate to heavy showers in the early afternoon and clearing light showers in the mid-afternoon. Late in the evening were further showers with moderate to heavy falls. On the 2nd were light to moderate showers in the first few hours of the day and then occasional brief light showers later in the early hours and in the early morning with 23.8 mm measured on the 2nd. Late in the morning was a brief light shower, with 0.2 measured on the 3rd. Light showers later in the evening on the 4th with 1 mm measured on the 5th. In the mid-morning of the 5th was a mild thunderstorm with brief heavy falls, followed by light to moderate showers and rain, became less frequent in the afternoon before clearing in the mid-afternoon. 24.7 mm was measured on the 6th. On the 11th a thunderstorm passed to the south at the start of the day with no rainfall. In the very late evening was light thundery rain with very brief moderate falls that was followed by a mild thunderstorm with moderate falls at the start of the 12th before light rain that cleared later in the early hours. 12.4 mm was measured on the 12th. In the late afternoon there was a severe thunderstorm with intense rainfall and fierce electrical activity with 28.6 mm measured on the 13th. On the 19th was a brief light shower in the middle of the day with no measurable rainfall.

Most of the observed rainfall fell in the first half of the month. A severe thunderstorm on the 12th brought intense rainfall of 20 mm in 12 minutes.

There was 4 days with falls of at least 25 mm (6 less than same month in 2020) with 10 days of less than 1 mm (4 less than same month in 2020).

Highest rainfall rate was 217.4 mm/hr on the 12 May 2021 at 4:34 PM. This is the highest monthly and daily rainfall rate for May on record exceeding the previous record high of 111.8 mm/hr in 2019 on 4 May at 2:11 PM.

The highest hourly rainfall total was 27.2 mm on the 12 May 2021 at 4:57 PM. This is the second highest hourly rain for May on daily and monthly basis and the highest since the current record high of 38.8 mm in 2015 on 1 May at 5:15 PM.

Number of severe thunderstorms: 0

Number of thunderstorms: 2 (Mild: 2, Moderate: 0)

Number of thunder days: 3 day

Number of nearby storms: 1

Severe thunderstorms of note in the Brisbane area: Nil

Remarks for month

Cloudy with showers on the 1st. From the late morning the temperature fell and became cold in the afternoon. Relative humidity was high or very high and elevated in the morning and afternoon that fell slowly in the morning and rose during the middle of the day.
Mostly cloudy on the 2nd, with the maximum temperature reached in the late morning and fell with a shower before rising a little in the afternoon. High to very high relative humidity in the late morning and afternoon
Variable temperature from the mid-morning to the mid-afternoon on the 3rd.
Sunny early on the 4th, with early morning mist.
On the 5th it was cloudy during the morning with rainfall including a thunderstorm. The temperature fell during the morning and became cold in the late morning and in the afternoon. Relative humidity was elevated and high or very high in the morning and early afternoon.
Mostly sunny on the 6th, after the minimum temperature occurred very early in the day before followed by stable or slowly rising temperature during the rest of the early hours.
Sunny in the morning of the 7th and 8th.
Cloudy periods on the 9th.
Mostly sunny on the 10th.
Mostly sunny on the 11th, after a hot start to the day as the temperature with a nearby thunderstorm before easing later in the early hours. The temperature rose slowly in the evening and became hot in the late evening.
On the 12th it cloudy before increasing clouds later in the afternoon with a severe thunderstorm with intense rainfall, fierce electrical and gusty S to SW winds. Mist in the early morning after a hot start to the day with the temperature falling slowly. Relative humidity was high in the morning and afternoon and especially with the thunderstorm before easing in the evening.
Sunny on the 13th and 14th.
Relative humidity rose slowly in the early hours that was low at times on the 14th.
Sunny on the 15th with the relative humidity low in the evening while rising slowly.
Sunny on the 16th, dew point was low at times in the mid to late morning and relative humidity was very low in the early hours.
Sunny on 17th after a cold start to the day. Dew point fell during the morning and became very low, partially rose early in the afternoon, and eased later in the afternoon. Relative humidity fell quickly during the morning becoming very low in the late morning and eased in the afternoon.
Sunny on the 18th with smoke haze later in the morning and in the evening from back burning at Enoggera.
On the 19th the maximum temperature was reached in the late morning before falling in the middle of the day and rising a little in the afternoon.
On the 20th it was sunny with the temperature variable from the mid-morning to the mid-afternoon.
Sunny in the morning of the 22nd.
Mostly sunny on the 23rd.
Sunny morning on the 24th with the temperature rising slowly or stable during the early hours and rose slowly in the evening that stabilised in the late evening.
Sunny in the morning of the 25th and temperature was rather variable in the afternoon that rose and fell several times.
Sunny with smoke haze developing in the afternoon of the 26th.
Mostly sunny on the 27th with smoke haze.
Sunny with smoke haze after a cold morning on the 28th.
Smoke haze on the 29th with the relative humidity low from early while falling before easing during the morning.
Mostly sunny morning on the 30th. The minimum temperature occurred at the start of the day before rising until the early morning. The relative humidity was low later in the early hours while falling before recovering from late in the early hours.
Mostly sunny on the 31st.
7 day of dew: Light (5 days) – 9th to 11th, 25th and 28th, Moderate (2 days) – 5th and 26th.

Weather influences

A high pressure system in the Tasman Sea extended a ridge along the east Queensland coast and much of the east Queensland coast. A weak surface trough extended along the east Queensland coast. An upper trough shifted east while amplifying over southern Queensland and brought instability to the region.
On the 2nd a high pressure system in the Tasman Sea continued to extend a ridge over eastern Queensland and over the state, which was aided from a upper trough amplifying over the south that continued to bring instability while shifting eastwards. A weak coastal trough lingered along the southern Queensland coast.
A high pressure system in the Tasman Sea continued to extend a ridge over eastern Queensland on the 3rd. A weak coastal trough lingered just off the southern Queensland coast, while shifting further offshore with more settled conditions.
On the 4th a high pressure system in the Tasman Sea maintained a ridge along the east Queensland coast. A new surface trough and cold front shifted eastwards across the state associated with an upper level low pressure system developing over New South Wales. This brought a renewed period of instability and further rainfall that moved into the southeast later in the day.
The surface trough and cold front shifted eastwards over the state on the 5th, extending into the east during the day, moving offshore in the evening. An upper level low over New South Wales shifted north-eastwards into the southeast in the evening. This continued to bring instability to the region.
On the 6th a broad circulation around a low pressure system and trough shifting eastwards over the northern Tasman Sea and well off the southern Queensland coast combined with a weak ridge of high pressure over central and western parts of the state to drive a relatively cool and dry air mass over most of the state.
A low pressure system in the Tasman Sea combined with a weak ridge of high pressure over central and western parts of the state to maintain a relatively dry and stable air mass over most of the state on the 7th.
A weak ridge extended over most of the state on the 8th. A weak surface and upper trough shifted across the southeast of the state with settled conditions in the region.
A weak ridge extends over most of the state on the 9th, while a weak trough extended over the inland. A weak upper level trough near the southeast shifted over the region later in the day with brought some instability in the region.
On the 10th a weakening ridge extended over most of the state, with a trough remaining slow moving over the interior. A weak trough in the Coral Sea extended by the east Queensland coast with some instability in the region.
A surface extended over the eastern inland that was slow moving and further north also on the 11th. A surface trough extended just off the southern Queensland coast and combined with an upper trough amplifying over the state enhanced instability and rainfall over eastern Queensland.
A surface trough remained over the southeast inland and a coastal trough moved towards the southern Queensland coast on the 12th. The troughs combined with an amplifying upper trough that brought instability including severe thunderstorms.
Early on the 13th the trough shifted off the east Queensland coast. Following this a firm ridge extended across the south of the state as a high pressure system developed in the Great Australian Bight and extended a relatively cool, dry and stable air mass throughout the state.
The high pressure system slowly shifted eastwards into the Great Australian Bight and extended a strengthening ridge over the state while maintaining a relatively cool and dry air mass over most of the state on the 14th to 16th. On the 16th the ridge along the east Queensland coast strengthened.
On the 17th a high pressure system over southern Australia extended a ridge over the state, maintaining a cool and dry air mass across the state.
The high pressure system moved into south-eastern Australia on the 18th that extended a ridge over the state with moist onshore flow along the east Queensland coast and cool and dry air mass further inland.
On the 20th a high pressure system in south-eastern Australia that moved into the Tasman Sea on the 21st extending a strengthening ridge along the east Queensland coast and moist onshore flow.
On the 22nd a high pressure in the Tasman Sea that shifted into the southern Tasman Sea on the 23rd and 24th. This extended a firm ridge over the state on the 22nd and a ridge on the 23rd to 24th. A weak upper trough moved over the region on the 23rd clearing early on the 24th, with some coastal instability in the region.
On the 25th a high pressure system in the Tasman Sea extends a weakening ridge along the east Queensland coast contracting northwards out of the region with stabile conditions.
A surface trough shifted eastwards over the southern Queensland on the 26th while approaching eastern Queensland later in the day.
The surface trough cleared off the east Queensland coast early in the day on the 27th as a high pressure system strengthened over the Great Australian Bight and extended a strengthening ridge and a cool, dry air mass across the state on the 27th and 28th.
On the 29th to 31st a strong high pressure system shifted eastwards into south-eastern Australia and extended a firm ridge over the state and a cool, dry air mass.

Daily weather notes

1/5/21: Cloudy with Cu and Ns clouds. Light showers in the first few hours of the early hours. A light shower in the late morning with some thunder from the edge of showers passing to the north, then moderate to heavy showers in the early afternoon before clearing light showers in the mid-afternoon. Further showers late in the evening with moderate to heavy falls. The temperature was warm from start of the day that fell slowly at the start of the day before falling during the rest of the early hours. In the morning the temperature rose while easing to near average before cooling during the morning to cool in the late morning as the temperature rose a little slowly. From the late morning the temperature generally fell that temporarily rose in the early afternoon before falling that became cold. The temperature then rose slowly before falling later in the afternoon and early in the evening that eased to cool and then to near average early in the evening. During the rest of the evening the temperature fell very slowly that became slightly warm and then warm later in the evening. Dew point rose a little at the start of the day that was moderately high, then fell during the rest of the early hours while easing to slightly above average and then rose in the morning that remained slightly above average. The dew point became generally stable from the late morning that was rather variable from the late morning to the mid-afternoon and became moderately high in the mid-afternoon. From the mid-afternoon the dew point fell before stabilising in the evening slightly above average or moderately high. Relative humidity was near average in the early hours that was stable before falling very slowly in the morning while becoming high and was elevated from the morning that became very high in the late morning. The relative humidity rose during the middle of the day that became stable. The relative humidity eased during the evening to slightly above average late in the evening. Light WNW to SSW winds from early with some variable winds that backed later in the morning to N to NE, that was followed by variable winds in the early afternoon and then ENE to SE winds during the rest of the afternoon and early evening, with some calm winds at times in the early evening. Light SW to SE during the rest of evening.
2/5/21: Mostly cloudy with Cu, Sc, Ac, As and Ci clouds. Light to moderate showers in the first few hours of the day, then occasional brief light showers later in the early hours and in the early morning before a brief light shower later in the morning. Warm in the early hours with the temperature stable or falling slowly before rising in the morning that eased to slightly warm and then to near average later in the morning. With the late morning shower, the temperature fell a little after the maximum temperature was reached before starting to rise again but generally fell during the rest of the morning. In the afternoon the temperature rose while remaining below the earlier maximum temperature and was slightly cool before falling from the mid-afternoon that eased to near average. In the evening the temperature fell slowly that was slightly warm becoming warm. Dew point was moderately high that was stable in the early hours, rose during the morning before falling later in the morning easing from moderately high to slightly above average. In the afternoon the dew point rose moderately high and fell from the mid-afternoon that was moderately high or slightly above average. Relative humidity was stable and near average until the early morning before falling a little in the morning and afternoon, that spiked briefly with the relative humidity becoming high from the late morning and was a little variable at times. In the early afternoon the relative humidity became very high and eased during the rest of the day to slightly above average in the early evening and to near average in the late evening. Light WSW to S winds with some variable winds and some calm winds at times in the early hours, became S to SW in the morning before backing during the morning to E to SE in the late morning. This was followed by NNE to ENE winds that tended SSW to SSE before SSE to ESE winds from the mid-afternoon. Light S to ESE winds early in the evening before S to SW winds later in the evening with calm winds at times.
3/5/21: Partly cloudy with Cu and Sc clouds. Warm from early in the day with the temperature stable or falling slowly in the early hours before easing to slightly warm from the morning as the temperature rose. After the maximum temperature was reached in the early afternoon the temperature eased to near average with variable temperature from the mid-morning to mid-afternoon. In the evening the temperature was slightly warm as the temperature fell from later in the afternoon. Dew point was slightly above average that fell a little in the early hours, rose in the morning, became generally stable later in the morning and in the afternoon the dew point became generally stable that was slightly above average becoming moderately high in the afternoon and early evening. During the rest of evening the dew point fell while easing to slightly above average. Relative humidity was near average while rising slowly early in the day, then fell in the morning that became slightly above average from the mid-morning. Slightly above average relative humidity from the mid-morning became moderately high in the mid to late afternoon as the relative humidity rose during the afternoon. In the evening while the relative humidity rose the relative humidity eased to slightly above average. Light S to SW and variable winds at times in the early hours with mostly calm winds before S to SSW winds in the morning. Light SSW to SE winds from the mid-morning, then SSW to SSE winds in the early afternoon after some variable winds, then SSE to ESE, then briefly calm winds before E to NE winds from the late afternoon. During the evening the wind was calm.
4/5/21: Sunny early becoming partly cloudy from the morning with Ci, Cc and Cs clouds with some Cu clouds. Early mist. Light showers later in the evening. Slightly warm in the first few hours of the day that became near average while the temperature fell in the early hours before starting to rise during the morning. The temperature became slightly warm from the mid-morning that became warm later in the evening as the temperature stopped falling and rose a little before falling later in the evening. The temperature was a little variable from the mid-morning to the mid-afternoon. Dew point started the day slightly above average which while the dew point fell during the rest of the early hours became near average before starting to rise in the morning, slightly above average. From the mid-morning the dew point stopped rising and became generally stable that was slightly above average becoming moderately high late in the evening. Relative humidity was close to average while rising slowly in the early hours, became slightly above average from the mid-morning and near average at times later in the morning and in the afternoon. In the evening the relative humidity was slightly above average. Calm winds early became light S to SW winds in the morning became S to SE with some E to NE winds later in the morning, then variable winds in the afternoon, becoming N to NE winds late in the afternoon. Calm winds during the evening with some variable winds.
5/5/21: Cloud increased in the morning and became cloudy easing to partly cloudy later in the morning with Cu, Ns, Ci, and Ac clouds. A mild thunderstorm with brief heavy falls in the mid-morning, followed by light to moderate showers and rain, became less frequent in the afternoon before clearing from the mid-afternoon. The temperature generally fell in the early hours that was a little variable and was warm that eased to near average in the morning as the temperature rose. From the mid-morning the temperature fell before and with the thunderstorm before falling slowly or was stable during the rest of the morning that became cool in the mid-morning and cold from later in the morning. In the early afternoon the temperature was stable before rising in the afternoon to the maximum temperature in the mid-afternoon. After the temperature fell from the mid-afternoon the temperature fell a little slowly in the evening that eased to cool in the late afternoon and to slightly cool in the evening. Dew point was moderately high at the start of the day that eased to slightly above average while the dew point fell in the early hours before generally rising in the morning. From the mid-morning the dew point eased to near average that became stable which after briefly rising in the mid-afternoon slightly above average, fell during the afternoon and in early evening close to average. Later in the evening the dew point was near average and stable. From early the relative humidity was close to average, then stopped falling and rose a little in the mid-morning and was high and became stable and elevated until the early afternoon being very high. During the rest of the afternoon the relative humidity generally fell before rising later in the evening which eased from high in the late afternoon to near average late in the evening. Mostly calm winds in the early hours with some NNW to WSW winds later in the early hours before W to SW winds became S to SW in the morning and afternoon with some W to SW winds and some calm winds in the mid-afternoon. Light W to SW winds in the late afternoon with some calm winds that was followed by mostly WNW to W winds in the evening.
6/5/21: Mostly sunny with some Cu and Ci clouds. The minimum temperature was reached very early in the day before was stable or rose slowly in the early hours with the temperature close to average from early. In the evening the temperature fell more slowly and became slightly warm. Dew point rose slowly in the early hours that eased from slightly below average at the start of the day to near average and rose in the morning. In the late morning the relative humidity fell slightly in the late morning, rose in the afternoon, and then fell slowly in the mid to late afternoon. In the evening the dew point fell slowly becoming stable late in the evening close to average. Relative humidity became slightly below average that was generally stable in the early hours. Relative humidity eased to near average from the mid-morning to the early afternoon as the relative humidity fell in the morning and then rose slowly in the afternoon that was slightly above average. Late in the afternoon the relative humidity eased to near average before becoming slightly above average from the early evening as the relative humidity rose a little slowly in the evening. Light WNW to WSW winds early with some calm winds until 2am and then W to NW winds in the morning with some W to SW winds, NW to SW winds later in the morning and became W to SW from later in the morning. Light W to WSW winds from the mid-afternoon and W to SW in the evening with some WNW winds.
7/5/21: Sunny in the morning with some Cu and Ci clouds and partly cloudy in afternoon with Cu and Sc clouds. Slightly warm from early in the day with the temperature falling a little slowly that was variable becoming near average later in the early hours that quickly returned to slightly warm as the temperature started to rise during the rest of the early hours and in the morning. In the afternoon the temperature eased back to near average after the maximum temperature was reached in the early afternoon and fell during the rest of the afternoon. In the evening the temperature was stable at times while falling slightly above average becoming warm later in the evening. Dew point fell slowly in the early hours close to average before rising from later in the early hours that became slightly above average or near average while rising. In the afternoon the dew point rose and was slightly above average before falling in the evening, slightly above average. Relative humidity was slightly below average that rose a little slowly in the early hours before falling from later in the early hours close to average. During the morning the relative humidity was slightly below average, easing back to near average from the mid-morning and slightly above average from the mid-afternoon as the relative humidity rose during the rest of the afternoon. In the evening the relative humidity was close to average that rose more slowly late in the evening. Light WNW to WSW winds early in the day, became W to SW before calm winds later in the early hours. In the morning winds were WSW to NW winds becoming W to SW, then WNW to WSW winds from the mid-morning with some SW winds. The wind then veered in the afternoon to N to NE in the mid-afternoon and then calm from late afternoon with some W to NW winds late in the evening.
8/5/21: Sunny in morning with Cu and Ci clouds, increasing to partly cloudy with Cu, Ci and Cs clouds in the afternoon. Warm from early in the day and eased to slightly warm from later in the early hours with the temperature stable at times while generally falling in the early hours. From the mid-morning the temperature became warm as the temperature rose in the morning and eased to slightly warm from the early afternoon as the maximum temperature was reached and the temperature fell. In the afternoon the temperature was a little variable and later in the evening the temperature fell slowly. Slightly above average dew point early in the day that fell slowly in the early hours, rose during the morning slightly above average and rose more slowly from the mid-morning. In the afternoon the dew point became moderately high before falling slowly in the evening while easing back to slightly above average. Near average relative humidity from early became slightly above average from the afternoon while the relative humidity rose. Mostly calm winds from early with some WSW to NW winds, light SW to SE winds later in the morning, then S to SE winds in the afternoon that tended NNW to NE from the mid-afternoon before calm winds in the evening.
9/5/21: Cloudy periods with Cu, Ci, Cs and CC clouds. The temperature was stable or rose slowly in the early hours and early morning that was slightly warm becoming briefly warm later in the early hours before easing back to near average in the early morning. In the morning the temperature was near average that became slightly warm from the late morning after the temperature rose during the morning that was a little variable. In the afternoon the temperature remained slightly warm. During the evening the temperature was slightly warm or warm while falling quite steadily before slowing late in the evening. Dew point was stable in the early hours before rising in the morning that was slightly above average that became moderately high from mid-morning while rising slowly from the mid-morning. The dew point became stable in the afternoon before falling from the late afternoon easing back to slightly above average later in the evening. Relative humidity was slightly above average in the early hours while slowly rising before starting to fall in the morning slightly above average. In the mid to late morning the relative humidity became moderately high while falling a little slowly before easing to slightly above average from the afternoon. Calm winds with some WSW to SSW winds or variable winds in the morning, then variable winds later in the morning, mostly NW to NE winds in the afternoon with some variable winds before calm winds in the evening.
10/5/21: Mostly sunny with Cu, Sc, Ci and Cc clouds. Slightly warm from early while falling slowly that eased to near average in the morning, slightly warm from the mid-morning and warm from later in the morning as the temperature rose quickly in the mid-morning before easing later in the morning. In the afternoon the temperature was a little variable after the maximum temperature was reached in the early afternoon before falling more quickly from later in the afternoon while remaining warm. Slightly above average dew point fell from early that became moderately high from the morning while the dew point rose slowly in the morning and fell slowly from the late morning. After rising a little later in the afternoon, the dew point fell slowly during the rest of the afternoon and evening. Slightly above average relative humidity from early that rose slowly or was stable until the mid-morning became moderately high in the mid-morning before dropping back to near average from later in the morning as the relative humidity fell. From the mid-afternoon the relative humidity was slightly above average while rising. Calm winds became light S to SW and then E to ESE in the mid-morning, NE to NW from later in the morning, NNE to NW in the late afternoon and calm winds in the evening.
11/5/21: Mostly sunny with Cu, Sc and Ci clouds. A thunderstorm passed to the south at the start of the day, then light thundery rain in the very late evening with very brief moderate falls. Warm and stable temperature at the start of the day, was followed by the temperature temporarily rising with the nearby thunderstorm becoming hot before falling during the rest of the early hours and was warm. The temperature remained warm during the morning and afternoon before easing to slightly warm in the mid to late afternoon as the temperature fell later in the afternoon. After initially falling in early evening the temperature rose slowly during the rest of the evening that became warm and then hot later in the evening. Dew point mostly fell in the early hours from moderately high at the start of the day to slightly above average after the nearby thunderstorm, though the dew point rose temporarily with the nearby thunderstorm. In the morning the dew point was slightly above average while rising slowly, fell slightly in the late morning, rose in the afternoon that remained slightly above average becoming moderately high from the mid-afternoon. Later in the evening the dew point rose slowly moderately high. Relative humidity was mostly near average from early while rising except with the passage of the nearby thunderstorm when the relative humidity fell temporarily and was slightly below average. Relative humidity was near average from the morning and slightly above average from the mid-afternoon as the relative humidity rose before near average relative humidity during the evening while rising slowly. Mostly calm winds in the early hours with some W to WSW winds followed by S to SW with and following the nearby thunderstorm with brief gusty but light winds with the passage of the thunderstorm. Light W to SSW winds at times later in the early hours and in the morning with mostly calm winds, light SSW to SSE winds in the morning became variable from the late morning, then SSW to E from the mid-afternoon, N to NE in the late afternoon before mostly calm winds in the evening with some variable winds.
12/5/21: Cloudy with Cu, Sc and As clouds before increasing clouds later in the afternoon with Cb clouds. A mild thunderstorm with moderate falls at the start of the day, followed by light rain that cleared later in the early hours. Mist in the early morning. Late afternoon severe thunderstorm with intense rainfall and fierce electrical activity. The temperature fell slowly at the start of the day, then fell a little before falling slowly during the rest of the early hours and was hot. In the morning the temperature was warm while rising slowly, eased to near average from the mid-morning that temporarily fell in the late morning before rising in the afternoon. After the temperature started to fall from the mid-afternoon the temperature fell sharply with the thunderstorm that fell 3 C in 15 minutes to 18 C before falling more slowly during the rest of the afternoon becoming cool. In the evening the temperature was near average that became slightly warm and was nearly stable. Dew point was moderately high that fell slowly in the early hours before starting to rise slowly in the morning. In the afternoon the dew point became stable before briefly falling sharply with the thunderstorm while easing to slightly above average. Following the thunderstorm, the dew point was stable slightly above average. Relative humidity was slightly above average while rising slowly from early, fell rather slowly in the morning and afternoon becoming high from the mid-morning. With the thunderstorm the relative humidity rose and became very high before the relative humidity rose slowly afterwards while easing back to slightly above average later in the evening. Light NNW to WSW winds at the start of the day was followed by S to SW winds with some W to SW and S to SE winds and calm winds at times. In the morning winds were mostly calm that became SSW to ENE, then S to SW later in the morning and in the early afternoon and then SSE to ESE in the mid-afternoon. With the thunderstorm were gusty S to SW winds before shifting NE to SE with and following the storm and some calm winds in the late afternoon and early evening. During the rest of the evening were light W to NW winds with calm winds at times.
13/5/21: Sunny. The temperature rose slowly from early before falling a little later in the early hours and in the early morning and was warm. In the morning the temperature eased to near average, became slightly warm in the mid-morning while the temperature rose before easing back to near average from later in the morning as the temperature rose more slowly. In the afternoon the temperature rose slowly until the mid-afternoon before falling. In the evening the temperature fell a little slowly and became slightly warm late in the evening. Dew point became moderately high from the start of the day that fell slowly, then rose a little in the morning easing to slightly above average before becoming stable from the mid-morning. From the late morning the dew point fell that eased to near average and became slightly below average from the mid-afternoon. During the evening the dew point was stable and remained slightly below average. Relative humidity was near saturation and slightly above average from the start of the day before falling in the morning slightly above average and near average later in the morning and in the afternoon as the relative humidity fell. Relative humidity eased to near average later in the morning and in the afternoon as the relative humidity fell. From the mid-afternoon the relative humidity became slightly below average and moderately low in the evening while the relative humidity rose slowly. Calm winds early before WNW to SW winds in the morning, light WNW to SW winds in the morning, W to SW winds in the afternoon and in the evening with some W to NW and SSW to SW winds during the evening.
14/5/21: Sunny. Near average temperature at the start of the day became slightly warm during the rest of the early hours with the temperature generally falling slowly that rose or was stable at times. In the morning and afternoon, the temperature was near average, which became slightly warm early in the evening as the temperature temporarily stabilised before resuming the fall in the temperature during the rest of the evening close to average. Late in the evening the temperature became slightly cool. Dew point was stable in the early hours that was slightly below average that became near average before dropping back to slightly below average from the morning with the dew point rising a little before stabilising from the mid-morning. In the late morning the dew point rose a little, was generally stable in the afternoon that fell a little later in the afternoon before stabilising in the evening slightly below average. Relative humidity was moderately low in the early hours and low at times with the relative humidity generally rising slowly before falling in the morning. Relative humidity eased from moderately low to slightly below average from the late morning and was stable during much of the afternoon. Early in the evening the relative humidity stopped rising and became moderately low before easing back to slightly below average during the rest of evening while rising. Light W to SW winds with some S to SW and W to NW winds from early, light WNW to WSW winds in the morning and some calm winds at the start of the day and in the early morning. Light winds became SSW to SW from the mid-morning and W to WSW from late in the morning. After the wind was temporarily calm there were W to NW winds in the early afternoon, light W to WSW winds followed during the rest of the afternoon, WNW to WSW early in the evening before calm winds during the rest of the evening.
15/5/21: Sunny with some Sc clouds later in the day. The temperature eased from slightly cool at the start of the day to cool later in the early hours. In the morning and afternoon, the temperature was near average that initially fell slowly in the afternoon before falling more quickly later in the afternoon. Early in the evening the temperature was near average before becoming slightly warm as the temperature fell slowly or was stable during the rest of the evening. Dew point was slightly below average that fell slowly in the early hours and rose a little in the morning. Slightly below average dew point was stable from the mid-morning, then generally fell in the afternoon becoming moderately low from the mid-afternoon before falling slowly from the late afternoon before stabilising later in the evening. Relative humidity eased from slightly below average at the start of the day to near average during the rest of the early hours. As the relative humidity fell quickly in the morning the relative humidity became slightly below average, becoming moderately low from the mid-afternoon and low during the evening while the relative humidity rose slowly from the late afternoon. Calm winds from early, became light SE to SW winds later in the morning then W to NW winds in the early afternoon and was followed by WNW to WSW during the rest of the afternoon and early in the evening with some SW winds. Later in the evening were W to SW winds.
16/5/21: Sunny. Near average temperature early in the day dropped to slightly cool and then cool late in the early hours as the temperature fell. In the morning the temperature was slightly cool while rising. In the morning and afternoon, the temperature was slightly cool, and the temperature stabilised during much of the afternoon. From later in the afternoon the temperature fell quickly and became cool before slowing later in the evening and fell very slowly late in the evening while remaining cool. Moderately low dew point was stable from early before rising a little from the mid-morning that was moderately low or low. From the late morning the dew point was moderately low while rising slowly in the afternoon, became stable in the afternoon before briefly rising sharply in the late afternoon. In the evening the dew point fell slowly before stabilising later in the evening while remaining moderately low. Relative humidity improved from very low at the start of the day to slightly below average in the early morning. In the morning the relative humidity fell quickly and fell slowly in the afternoon that was moderately low. From later in the afternoon the relative humidity eased to near average as the relative humidity rose quickly later in the afternoon and early evening. Light W to SW winds from early before mostly calm winds later in the early hours and in the early morning with some variable winds. Light S to SW winds in the morning that tended S to SE in the late morning and early afternoon, then variable winds in the afternoon, light W to SW winds later in the afternoon before calm winds from the late afternoon.
17/5/21: Sunny with some Ci and Cc clouds in the middle of the day clearing in the afternoon. Cool from early in the day became cold later in the early hours and in the early morning while the temperature fell slowly in the early hours. In the morning the temperature rose sharply easing to near average temperature from the mid-morning with the temperature rising more slowly from the mid-morning and during the afternoon. Later in the afternoon and in the early evening the temperature fell quickly becoming cool from the late afternoon. Later in the evening the temperature fell more slowly becoming stable late in the evening. Dew point was moderately low that was initially stable, fell slowly during the rest of the early hours, rose quickly in the morning before falling during the rest of the morning and fell to a low of -1.2 C just before midday and became very low. In the afternoon the dew point rose partially and eased to low and after temporarily falling in the mid-afternoon, the dew point rose a little further in the mid-afternoon and eased to moderately low. In the evening the dew point was moderately low and stable. Relative humidity was near average that rose slowly in the early hours that fell quickly in the morning reaching a low of 23% in the late morning having dropped from near average in early morning to very low in the late morning. The relative humidity rose slowly in the afternoon while easing to moderately low later in the afternoon before near average or slightly below average relative humidity in the evening that rose a little slowly that stabilised later in the evening. Wind was calm before light WNW to WSW winds in the morning, W to WNW in the late morning, WNW to WSW in the afternoon, SSW to W from the mid-afternoon before calm winds in the late afternoon. Early in the evening were some W to WSW winds with mostly calm winds otherwise in the evening.
18/5/21: Sunny morning with some Ci and Cs clouds and partly cloudy in afternoon with Cu and Sc clouds. Increasing smoke haze from the late morning and in the afternoon from back burning at Enoggera. Cool from early in the day with the temperature falling slowly or was stable in the early hours, rose slowly later in the early hours before starting to rise in the morning to near average from the mid-morning. In the mid to late afternoon the temperature eased to slightly cool after the maximum temperature was reached in the early afternoon but was a little variable. In the evening the temperature was near average before becoming slightly warm late in the evening as the temperature stopped falling and rose slowly or was stable during the rest of the evening. Dew point was stable or rose slowly in the early hours before rising in the morning that was moderately low easing to slightly below average from half-way through the early hours. Slightly below average dew point in the morning eased to near average from the mid-morning that rose during the morning, then fell slowly from the early afternoon before stabilising late in the evening. Relative humidity was slightly below average that rose slowly in the early hours before rising in the morning easing to near average from the mid-morning while the relative humidity fell quickly in the morning and before stabilising in the afternoon. As the relative humidity rose from the mid-afternoon it became slightly above average before easing to near average in the evening before becoming slightly below average late in the evening after the relative humidity stopped rising. Mostly calm winds from early before light S to SSW wind in the morning, SSW to SSE winds in the late morning, backed during the afternoon to E to SE from the mid-afternoon followed by S to ESE winds early in the evening with some calm winds. During the rest of the evening the wind was mostly calm winds with some S to SW winds.
19/5/21: Partly cloudy with Cu and Sc clouds. A brief light shower in the middle of the day. The temperature fell slowly in the early hours that was a little variable and was slightly warm, easing to near average in the morning. In the afternoon the temperature became slightly cool after the maximum temperature was reached in the late morning as the temperature fell in the middle of the day and rose a little in the afternoon. From the late afternoon the temperature was near average. Dew point was stable from early, rose in the morning and early afternoon, and generally fell slowly in the afternoon and evening close to average. The relative humidity was a little variable that generally rose very slowly in the early hours slightly below average before falling in the morning becoming moderately low that eased to near average by the mid-morning while the relative humidity fell slowly. In the middle of the day the relative humidity rose temporarily with the brief shower becoming high before easing back to slightly above average or moderately high in the afternoon while rising slowly. In the evening the relative humidity was near average while rising. Calm winds early with periods of S to SW winds in the early hours before light S to SSW winds in the morning, backed in the late morning to E to SE in the afternoon with some S to SE winds, then some calm winds in the late morning and calm winds in the evening.
20/5/21: Sunny morning with some clouds and partly cloudy with Cu and Sc clouds in the afternoon. The temperature was near average from early that was stable or fell slowly in the early hours before rising quickly in the morning that was near average from the morning. The temperature was variable in the early to mid-afternoon before the temperature was mostly slightly cool from the late afternoon though was briefly near average early in the evening. Dew point was near average that fell slowly in the early hours, rose in the morning, fell slowly from the late morning, rose slightly in the late afternoon before falling slowly in the evening. Relative humidity rose slowly in the early hours before falling in the morning close to average that remained close to average through to the afternoon before slightly above average relative humidity from the late afternoon while the relative humidity rose before easing back to near average later in the evening while rising slowly. Calm winds from early before light S to SW winds in the morning with some S to SSE winds later in the morning, SSW to E winds in the afternoon with some variable winds, E to SE later in the afternoon before mostly calm winds in the evening.
21/5/21: Partly cloudy with Cu and Sc clouds. The temperature was slightly cool while falling slowly in the early hours and was near average in the morning and afternoon that became a little variable in the late morning and in the afternoon before becoming slightly cool from the mid-afternoon as the temperature fell. Early in the evening the temperature was near average that became generally slightly warm with the temperature rising for a period early and later in the evening while generally falling. Dew point was near average that fell slowly in the early hours and early morning, rose a little before rising slowly in the morning. In the afternoon the dew point became stable after briefly falling sharply in the early afternoon before rising later in the afternoon and in the early evening. Later in the evening while remaining close to average the dew point fell slowly. Relative humidity was near average that rose slowly in the early hours, was near average in the morning, slightly below average or near average from the early afternoon and was slightly below average early in the evening. Later in the evening the relative humidity generally rose slowly. Mostly calm winds from early were followed by light S to SW winds in the morning, became S to SE later in the morning, backed during the afternoon to E to SSE and E to SE in the mid-afternoon. In the late afternoon and early evening were S to SE winds with some S to SW winds which after a period of calm winds was followed by S to SSW later in the evening.
22/5/21: Sunny in the morning and partly cloudy in the afternoon with Cu and Sc clouds from the morning. The temperature generally fell while rising and falling a few times in the early hours and early morning close to average or slightly warm. Near average temperature in the morning and afternoon and was a little variable in the late morning and in the afternoon. Later in the afternoon the temperature was generally close to average before becoming slightly warm early in the evening with the temperature falling slowly. Later in the evening the temperature fell more quickly close to average. Dew point generally fell slowly while rising and falling a few times before rising in the morning while remaining close to average. The dew point fell slightly in the early afternoon, then rose slowly before falling slowly from the mid-afternoon that remained close to average. Relative humidity was slightly below average in the early hours while rising which eased to generally near average except for briefly slightly above average relative humidity in the mid-afternoon and slightly below average early in the evening. Light S to SW winds with calm winds at times from early before S to SSW winds in the morning, tended S to SSE from the mid-morning, SSE to ESE winds from the late morning, then light S to SE early in the evening became mostly S to SW before calm winds late in the evening.
23/5/21: Mostly sunny with Cu and Sc clouds. The temperature was near average that was stable or rose slightly during the early hours and was near average from the morning that was briefly slightly above average early in the evening as the temperature fell a little slowly. The temperature was a little variable in the morning and afternoon. Dew point was close to average that was generally stable in the early hours before rising slowly in the morning, stabilised in the afternoon before falling slowly in the afternoon and evening. Relative humidity was near average from early that was stable in the early hours, becoming temporarily slightly below average early in the evening when the relative humidity became stable and was near average during the rest of the evening. Calm winds in the early hours and early morning with some S to WSW winds at times before light S to SSW winds in the morning, S to SE in the afternoon with some E to SE winds and S to SW winds. Calm winds in the late afternoon and early evening, followed by SW to ESE winds before calm winds late in the evening.
24/5/21: Sunny morning and partly cloudy in the afternoon with Cu and Sc clouds from morning. Near average temperature from early except for a slightly warm temperature in the early morning after the temperature was stable in the first few hours of the day that rose slowly or was stable later in the early hours and later in the evening as the temperature rose slowly in the evening becoming stable in the late evening. The temperature was a little variable in the afternoon. Dew point was stable or rose slowly in the early hours before rising slowly in the morning, fell slowly from the late morning before rising slowly later in the evening close to average. Relative humidity was near average in the early hours before becoming slightly below average in the morning with the relative humidity stable until the early morning and eased back to near average during the morning. Mostly calm winds early with S to SSW winds during the rest of the early hours, then light S to SW winds in the morning with some S to SSE winds, SSW to SSE from the late morning, became S to SE in the afternoon with some E to SE before calm winds early in the evening. Late in the evening were some S to SW winds.
25/5/21: Cu and Sc clouds and was sunny in the morning and partly cloudy in the afternoon. Slightly warm at the start of the day with the temperature stable that eased to near average during the rest of the early hours and from the morning. In the afternoon the temperature was rather variable that rose and fell several times. Dew point was close to average that rose slightly at the start of the day, fell during the rest of the early hours, rose slowly in the afternoon, dropped slightly in the early afternoon, generally rose slowly in the afternoon before falling slowly in the evening. Relative humidity was slightly below average at the start of the day before easing back to near average while the relative humidity rose slowly in the early hours. Near average daytime relative humidity became slightly above average from the mid-afternoon as the relative humidity rose from the mid-afternoon. Light WSW to SSE winds in the first 2 hours of the day, followed by calm winds before light SSW to SSE winds in the morning, then S to ENE in the afternoon, N to ENE from the mid-afternoon with some variable winds in the afternoon before calm winds in the evening.
26/5/21: Sunny before some Cu clouds from later in the afternoon. Smoke haze developed in the afternoon. The temperature generally fell very slowly in the early hours that was a little variable before rising in the morning becoming slightly cool easing to near average from the mid-morning. In the afternoon the temperature became slightly warm as the temperature rose slowly and then became stable in the afternoon. From the late afternoon the temperature became near average while falling. Dew point was close to average that was stable or fell slowly in the early hours, then rose in the morning, became stable from the mid-morning, fell slightly in the early afternoon, and stabilised again before rising from the mid-afternoon. In the evening the dew point was near average that fell slowly. Relative humidity rose very slowly from early that was near average and became slightly above average in the morning while the relative humidity stabilised. Relative humidity then fell quickly from the mid-morning close to average becoming slightly below average in the early to mid-afternoon. Near average relative humidity in the late afternoon and was near average or slightly above average in the evening. Mostly calm winds in the early hours with some NW to SW winds before light SW winds in the morning with some calm winds. Light N to NW winds later in the morning with some WNW to WSW winds, NNW to W winds in the afternoon with some SSW to WSW winds before calm winds from the late afternoon.
27/5/21: Mostly sunny with Ac, Cc and Ci clouds clearing during the day. Smoke haze. The temperature was near average that fell slowly in the early hours, then became briefly slightly warm in the mid-morning before easing back to near average. The temperature was a little variable from the mid-morning to the mid-afternoon and rose rather slowly later in the morning and in the afternoon. Late in the evening the temperature became stable or fell slowly becoming slightly cool. Dew point was near average that was stable in the early hours and early morning, then rose a little in the morning, became stable from the mid-morning that was close to average, fell slowly in the afternoon before rising a little later in the afternoon. In the evening the dew point fell and became slightly below average in the late evening. Near average relative humidity rose slowly from early before becoming slightly below average during the morning while the relative humidity fell quickly before easing to near average from the late morning while falling more slowly. In the mid-afternoon the relative humidity became slightly below average before rising and easing back to near average later in the afternoon. Later in the evening the relative humidity stopped rising and fell slowly, slightly below average. Mostly calm winds with some SW winds in the early hours before light W to SW winds in the morning with some calm winds tended S to SW from the mid-morning with some WSW winds, which after some S to SE winds in the afternoon was followed by W to SW winds in the mid-afternoon. Calm winds followed before ENE to ESE winds in the late afternoon and early evening, then mostly calm winds during the rest of the evening with some SW winds.
28/5/21: Sunny with smoke haze. Slightly cool early becoming cold in the early morning as the temperature fell slowly or was stable at the start of the day before falling during the rest of the early hours. The temperature eased to slightly cool from the morning that temporarily eased to near average after the temperature rose quickly in the morning and more slowly later in the morning and in the afternoon. As the temperature fell quickly from the late afternoon the temperature became cool in the late afternoon and in the evening. Dew point fell slowly in the early hours slightly below average becoming moderately low from early in the morning as the dew point rose in the morning, stabilised from the mid-morning, fell from the late morning before rising slowly in the afternoon easing to near average from the late afternoon. In the evening the dew point fell slightly below average. Relative humidity was slightly below average that generally rose slowly in the early hours. Relative humidity remained slightly below average from the morning which became stable during the afternoon and eased to near average from the late afternoon. Later in the evening the relative humidity rose more slowly. Mostly calm winds from early with some light SW winds and some W to WSW winds in the morning with some winds that tended S to SW with some variable winds, shifting to W to SW with some S to SW winds in the afternoon before calm winds from the late afternoon. In the evening were mostly calm winds with some light W winds.
29/5/21: Partly cloudy with Cu and Sc clouds. Smoke haze. Cool in the early morning with the temperature rising and falling several times while generally falling, eased back to near average in the morning and was cool from the mid-morning with the temperature rising a little slowly, though was slightly cool in the early afternoon. In the evening the temperature was cool. Moderately low dew point while falling in the early hours, then rose slowly in the morning, became stable in the afternoon, rose slightly from the mid-afternoon before falling slowly in the evening that remained moderately low. Relative humidity generally fell from the start of the day that was slightly below average that dropped to moderately low and then to low from later in the early hours. During the morning the relative humidity eased from low to slightly below average in the mid-morning with the relative humidity fell quite steadily until the early afternoon. In the evening the relative humidity was near average. Mostly calm winds with W to SW winds at times with some S to SW winds before S to SW winds in the morning with some W to S winds, light S to SW winds in the afternoon that was S to SSE for a period, S to SSW from the mid-afternoon that was followed by W to SW winds in the late afternoon before calm winds in the evening.
30/5/21: Mostly sunny morning with Ci and Sc before partly cloudy and increasing Cu and Sc clouds in the afternoon. The minimum temperature occurred at the start of the day before rising during most of the remainder of the early hours before falling a little late in the early hours and in the early morning with the temperature easing from cool at the start of the day to near average which briefly became slightly warm in the early morning. Slightly cool from the mid-morning that was briefly near average early in the evening when the temperature stabilised, with the temperature a little variable from the mid-morning to the mid-afternoon. Late in the evening the temperature stopped falling and rose slightly and was slightly cool. Dew point was moderately low that rose a little and eased to slightly below average early in the day, then fell slowly until the early morning and became moderately low from the early morning while rising in the morning that eased to slightly below average in the late morning. In the afternoon the dew point became stable, fell slowly in the evening before rising slightly late in the evening that remained slightly below average. Relative humidity eased during the early hours and became low in the mid to late early hours while the relative humidity generally fell and rose a little later in the early hours. Moderately low relative humidity in the early hours eased to slightly below average from the mid-morning while falling that eased to near average in the afternoon and in the evening. This was after the relative humidity stopped falling from the early afternoon. Calm winds at the start of the day until light S to SW winds developed with some WSW to W winds, SSW to SSE in the early morning before light S to SW winds in the morning. This was followed by SW to WSW winds in the early afternoon, then light SSW to SSE winds in the rest of the afternoon becoming calm in the evening.
31/5/21: Mostly sunny becoming partly cloudy in the afternoon with Cu and Sc clouds. Near average temperature was generally stable during the early hours before falling a little in the early hours. In the morning the temperature was close to average that became slightly cool from the mid-morning that rose a little slowly in the morning, fell slowly in the afternoon and fell quickly early in the evening before falling more slowly later in the evening. Slightly below average dew point fell slowly in the early hours that was slightly below average before rising slowly in the morning close to average. The dew point slipped slightly to slightly below average before near average dew point from the late morning while rising slowly in the morning. The dew point stabilised in the afternoon, rose slightly in the mid-afternoon before falling during the rest of the afternoon and in the evening. In the early hours and in the morning the relative humidity generally fell slowly that was slightly below average or moderately low becoming moderately low from late in the early hours. In the morning the relative humidity fell rather slowly in the morning which after becoming moderately low in the early morning eased back to near average in the mid-morning. The relative humidity eased to slightly above average from the early afternoon while the relative humidity became stable during the afternoon before rising from the late afternoon. Light SSW to SSE winds early in the day with some calm winds before mostly calm winds that was followed by light WSW to SSW winds late in the early hours and early in morning. Light WSW to SSW winds in the morning tended SSW to SSE from the mid-morning, S to SSE in the afternoon with some NE to SE winds and calm winds in the mid to late afternoon and in the evening.

Station records for May 2021

NOTE: This is a summary of the aforementioned monthly records exceeded over a monthly basis. Additionally, it lists records that are the lowest or highest in at least 5 years. See end notes for more information about record periods.

Record low May mean daily maximum temperature in at least 5 years
Observed [C]	Most recent lower	Years of record	Monthly average
24.2	24.1 in 2015	11	24.2


Record low May mean temperature in at least 5 years
Observed [C]	Most recent lower	Years of record	Monthly average
18.2	=18.2 in 2015	11	18.3


Record high May maximum temperature
Observed [C]	Old record	Years of record	Monthly average
29.3 on 10th at 1:21 PM	29 in 2016 on 3rd at 3:01 PM	11	24.2


Record low May mean daily minimum MSL pressure in at least 5 years
Observed [hPa]	Most recent lower	Years of record	Monthly average
1017	1014.9 in 2016	11	1016


Record low May mean daily maximum MSL pressure in at least 5 years
Observed [hPa]	Most recent lower	Years of record	Monthly average
1021.1	1019.9 in 2016	11	1021.5


Record low May mean MSL pressure in at least 5 years
Observed [hPa]	Most recent lower	Years of record	Monthly average
1019.1	1017.4 in 2016	11	1019.5


Record low May minimum MSL pressure in at least 5 years
Observed [hPa]	Most recent lower	Years of record	Monthly average
1006.3 on 6th at 2:41 PM	1005.8 in 2016 on 27th at 2:55 PM	11	1019.2


Record low May maximum MSL pressure in at least 5 years
Observed [hPa]	Most recent lower	Years of record	Monthly average
1027.3 on 19th at 9:38 AM	1026 in 2010 on 2nd at 10:00 AM	11	1021.5


Record low May mean daily maximum relative humidity
Observed [%]	Old record	Years of record	Monthly average
94.6	93.6 in 2012	11	89


Record low May daily maximum wind gust
Observed [km/hr]	Old record	Years of record	Monthly average
31 on 12th at 4:31 PM	34.8 in 2012 on 28th at 12:15 PM	11	19.1


Record low May daily maximum wind speed
Observed [km/hr]	Old record	Years of record	Monthly average
16 on 13th at 12:14 PM	17.2 in 2012 on 29th at 11:50 AM	11	7.7


Record low May mean wind speed in at least 5 years
Observed [km/hr]	Old record	Years of record	Monthly average
1.2	=1.2 in 2014	9	2.5


Record low May mean daily wind gust in at least 5 years
Observed [km/hr]	Most recent lower	Years of record	Monthly average
21.6	20.9 in 2014	11	19.1


Record low May mean daily wind speed in at least 5 years
Observed [km/hr]	Most recent lower	Years of record	Monthly average
10.6	8.5 in 2012	11	7.5


Record high May rainfall total in at least 5 years
Observed [mm]	Most recent higher	Years of record	Monthly average
99.5	222.2 in 2015	33	103


Record high May maximum rainfall rate
Observed [mm/hr]	Old record	Years of record	Monthly average
217.4 on 12th at 4:34 PM	111.8 in 2019 on 4th at 2:11 PM	33	46.7


Record high May highest hourly rainfall total in at least 5 years
Observed [mm]	Most recent higher	Years of record	Monthly average
27.2 on 12th at 4:57 PM	38.8 in 2015 on 1st at 5:15 PM	33	10.4

Key records for May 2021

NOTE: These records are drawn from automatic data record for this site. See end notes for more information.

All time records

No records

Monthly records

Maximum Temperature: 29.3 °C on 10 May 2021 at 1:21 pm

Maximum Rainfall Intensity: 217.4 mm on 12 May 2021 at 4:34 pm

Data summary tables for May 2021

Summary of Averages and Extremes for May 2021 for Ferny Grove, Brisbane, Queensland, Australia
	Min Temp	Max Temp	Mean Temp	Temp Range	Min Grass Temp	Min Grass Temp Depression	Min Relative Humidity	Max Relative Humidity	Mean Relative Humidity	Min MSL pressure	Max MSL Pressure	Mean MSL Pressure	Dew Point	Max Wind Gust	Max Wind Speed	Daily rain
Average	12.1	24.2	18.2	12.1	10.0	2.2	52.7	94.7	73.7	1016.8	1020.9	1018.8	13.1	21.4	10.5	3.2
Min	6.1	18.2	14.7	3.1	4.2	0.7	22	85	59	1006.3	1010.8	1008.6	-1.3	14.0	5.0
Max	17.0	29.3	22.0	17.1	15.1	3.8	86	98	92	1024.6	1027.3	1026.0	20.6	31.0	16.0	28.6
Total																99.5

Summary for May 2021 from long term average for Ferny Grove, Brisbane, Queensland, Australia
	Temperature	Relative Humidity	MSL Pressure	Dew Point	Wind Gust	Wind Speed	Rainfall	Rainfall as Fraction of monthly average (%)
Average	-0.1	+2.9	-0.4	+0.6	+2.5	+2.9	-3.5	96.6
Min	-0.2	+0.2		+0.1
Max	+0.0	+5.6		+1.0			+61.8

Monthly averages and extremes for Year of 2021 to Date for Ferny Grove, Brisbane, Queensland, Australia
	Temperature					Temperature Anomaly from Long Term Avg.			Rain total	Rain Anomaly	Rain days
	Avg Min	Avg Max	Low Min	High Max	Average	Min	Max	Average
Jan-21	20.0	29.9	16.6	36.6	24.9	-0.6	-0.8	-0.7	95.8	-49.2	19
Feb-21	20.3	30.4	17.3	36.1	25.3	-0.0	+0.4	+0.2	126.2	-35.6	14
Mar-21	19.4	28.7	14.8	34.6	24.0	+0.2	-0.0	+0.1	297.3	+173.1	17
Apr-21	14.7	26.5	9.1	33.7	20.6	-1.3	+0.0	-0.7	130.1	+36.3	9
May-21	12.1	24.2	6.1	29.3	18.2	-0.2	+0.0	-0.1	99.5	-3.5	7
YTD	17.3	27.9	6.1	36.6	22.6	-0.4	-0.1	-0.2	748.9	+121.1	66

Min Temperature and time of occurrence for May 2021
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
16.2	16.3	14.9	13.1	15.1	11.1	12.9	14.2	14.9	14.6	14.8	17.0	15.8	12.7	8.7	7.8
5:31 A	6:27 A	4:21 A	6:11 A	6:02 A	1:47 A	4:25 A	6:36 A	6:34 A	5:18 A	5:54 A	6:46 A	6:47 A	1:21 A	6:20 A	6:36 A
17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
6.1	8.7	14.2	10.8	9.9	11.8	12.5	12.3	12.3	10.8	11.8	8.1	7.7	8.3	11.0
6:25 A	3:56 A	5:13 A	5:26 A	6:17 A	6:43 A	2:35 A	11:53 P	5:29 A	6:47 A	5:00 A	6:44 A	4:22 A	12:25 A	4:26 A
Max Temperature and time of occurrence for May 2021
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
20.5	22.8	26.4	26.1	18.2	24.2	26.4	26.9	27.3	29.3	27.7	25.3	24.8	24.9	24.7	21.8
10:56 A	9:53 A	12:23 P	2:11 P	3:43 P	1:57 P	1:07 P	1:08 P	2:16 P	1:21 P	1:30 P	2:14 P	1:47 P	2:39 P	12:44 P	1:56 P
17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
23.2	23.2	22.3	24.5	23.7	24.6	24.5	24.1	24.4	26.0	24.9	22.1	21.6	21.9	22.0
2:46 P	12:22 P	10:39 A	2:12 P	1:54 P	2:27 P	1:51 P	2:40 P	12:04 P	2:51 P	1:39 P	2:01 P	1:15 P	12:41 P	12:13 P
Daily Rainfall for May 2021
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
7.9	23.8	0.2	0.2 Dew	1.0	24.7	0.0	0.0	0.1 Dew	0.1 Dew	0.1 Dew	12.4	28.6	0.0	0.0	0.0
17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1 Dew	0.2 Dew	0.0	0.1 Dew	0.0	0.0	0.0

Temperature values coloured according to its difference from the long-term average for this month. Outlined value mark highest and lowest values.

temperature colour scale

Maximum temperatures are measured over the 24 hours from 9 am on the day of measurement. Minimum temperatures are measured over the 24 hours to 9 am of the day of measurement. This was previously different to the official time standards and measured in degrees ºC (before 2018).

rainfall colour scale

Rainfall is measured over 24 hours to 9am and recorded on that day. This is the same as the official time standard and measured in millimetres. Some measurements are not made at 9am and is adjusted based on the automatic record. For other variables see Notes below.

Notes

Based on Bureau of Meteorology Climate summaries (Copyright) of which some data was obtained from. From September 2017 the Bureau of Meteorology Climate summaries were expanded to provide data from official stations in and near the Greater Brisbane “Greater capital city Statistical Area” (GCCSA).

Data Copyright Ferny Grove Weather 2021, Produced 25/8/21. Data Checking has been carried out, but errors may still be present and therefore there is no assurance of correctness. Corrections may be made at a later data if errors or deficiencies are found and/or improvements in data handling techniques are made, though data with major improvements may not be updated in this summary. Data measured with professional moderate accuracy equipment. This replaced non professional equipment of low accuracy with differences in the measured data. The new equipment measures the daily average wind speed and wind run about 40 % higher. Daily rainfall and grass minimum temperature is measured using non-professional equipment of moderate accuracy.

Site Commencement data is April 15 2009 except for daily rainfall which commenced on January 1 1987. Not all variables have been measured over the entire station record. Most variables are measured over a 24 hour period ending in the evening and over a 24 hour period from midnight effective October 5 2018. Maximum temperatures are measured over the 24 hours from 9 am on the day of measurement. Minimum temperatures are measured over the 24 hours to 9 am of the day of measurement. Rainfall is measured over 24 hours to 9am and recorded on that day. This is the same as the official time standard. Some rainfall measurements are not made at 9am and is adjusted based on the automatic record. Minimum Grass Temperature is measured over an approx. 12 hour period ending in the early morning. MSL refers to Mean Sea Level, which is the standard meteorological method of measuring air pressure reduced to sea level based on both elevation and temperature. Grass Minimum Depression is the difference of the grass minimum temperature from the air temperatures and is a positive value when the grass temperature is below the air temperature.

Up until March 9 2019 automatic records as Dew Point, Average Wind Speed, Dominant Wind Direction, Wind Run, Rain Rate and Hourly Rain are measured over a 24 hour period starting at midnight and recorded for that day. This started on the 6 October 2011. The automatic record is used for some data and also may be used if data is not available/ not suitable. From March 9 2019 the automatic record became the official record instead, simplifying this process. Until replaced on 5 October 2018 the temperature and humidity sensor is under exposed so minimum temperature and maximum humidity are incorrect and low accuracy rain gauge is used which are not used as the site’s official record. This data limitation does not apply to other measurements of temperatures, air pressure and humidity, wind gust, daily and monthly rainfall and rain days elsewhere in this summary which are recorded separately and form the official record for this site. The replacement equipment is sited in more exposed locations and therefore the limitations don’t apply, though the automatic daily rainfall doesn’t form the official data for the site.

Long term averages are based on all available long period past measurements from October 2019 whilst for non automatic rainfall is based on 1987 to 2017 average from the station record. Prior to this the long term average for Temperature, Relative Humidity and Air pressure is based on 2009 to 2015 average from the station record and wind speed is based on the 2010 to 2018 average from station record. Wind Run is 2011 to 2018 and Rain Rate and High Hourly Rain is 2011 to 2017.

The Fraction of monthly average expresses how much has fallen in respect to the long term average listed as a percentage. The decile ranking compares the rainfall total to the historical record for the site where the record is divided into 10 equal groups. Decile 1 is the lowest 10% of the record (10th percentile) and Decile 10 (90th percentile) is the highest 10% of the record. Decile 1 is considered “very low”, decile 2 and 3 “low”, decile 4 to 7 “average”, decile 8 and 9 “high” and decile 10 “very high”.

Monthly Meteorological Report for Ferny Grove, Brisbane in May 2021 – near average temperatures and rainfall