Brisbane, Queensland, Australia, Latitude 27°S 23' 52", Longitude 152° E 55' 35", Elevation 76 m
Sun 1 Oct 2023 9:50:17 pm: Temperature: 17.6 °C, Humidity: 84 %, Wind speed: 0 km/h, Wind Gust: 4 km/h, Rain today: 0.0 mm, MSLP: 1021.5 hPa
Website under continual development from 11 years of weather data. Please contact us if you find issues or like to provide feedback.
During April at Ferny Grove overnight temperature were below average. Daytime temperatures were close to average and the coolest in 11 years. Rainfall was above average and in the highest in 6 years with most rainfall occurring in the first week of the month. Mean relative humidity was near average, mean dew point was below average and mean air pressure was below average. There were 0 thunderstorms (1 thunder day).
Monthly mean daily minimum temperature: 19.4 ºC, 0.2 ºC above average and 0.7 ºC higher than same month in 2020.
Monthly mean daily maximum temperature: 26.5 ºC, equal to the long term average and 2.6 ºC lower than same month in 2020. This is the lowest on record for April since 26.1 ºC in 2012.
Monthly mean temperature: 20.6 ºC, 0.7 ºC below average, 2 ºC lower than the same month in 2020. This is the equal lowest on record for April equalling the current record low of 20.6 ºC in 2017.
Lowest temperature: 9.1 ºC on 23 April 2021 at 6:19 AM. Same month in 2020 was 11.9 ºC. This is the lowest on record daily and monthly minimum temperature for April on record exceeding the previous record of 9.8 ºC in 2015 on 27 April at 6:10 AM.
Highest temperature: 33.7 ºC on 10 April 2021 at 1:24 PM. The same month in 2020 was 34.2 ºC. This is the second highest monthly and daily maximum temperature for April on record and the highest since the current record high of 34.2 ºC in 2020 on 17 April at 3:19 PM.
Lowest daily maximum temperature: 21.7 ºC on 4 April 2021 at 1:23 PM. This is the lowest since 18.9 ºC in 2015 on 30 April at 12:00 AM. Same month in 2020 was 24.7 ºC.
Highest daily minimum temperature: 20.4 ºC on 6 April 2021 at 2:24 AM. Same month in 2020 was 20.6 ºC.
April minimum temperatures were near or above average in the first 10 days of the month before an extended period of below average temperatures during most of the remaining of the month. Minimum temperatures were 2 ºC to 4 ºC above average on the 3rd to 8th. The 12th to 16th was between 2 ºC and 5 ºC below average (on the 12th and 14th) and warmed to 3 ºC above average on the 17th. A 12 day period until the 29th of below average temperatures of up to 7 ºC below average that was at least 5 ºC below average on the 22nd to 25th.
Maximum temperatures during April were near average or below average throughout the month with some above average temperatures. The 3rd to 6th was 3 ºC to 5 ºC below average, before warmer days on the 8th and 11th that peaked at 7 ºC above average on the 10th. The 15th and 16th were 3 ºC to 4 ºC above average and cooled to 2 ºC below average on the 17th. It warmed to 4 ºC above average on the 21st, cooled to 2 ºC to 4 ºC below average on the 22nd and 23rd. The 30th was 2 ºC below average.
The mean year to date temperature of 23.7 ºC was 0.3 ºC below average and the lowest for January to April since 23.5 ºC in 2013.
Monthly Mean Minimum Grass Temperature: 13 ºC (1.6 ºC lower than same month in 2020).
Lowest Minimum Grass Temperature: 7.7 ºC on 23 April 2021 (2.9 ºC lower than same month in 2020). This coincided with the lowest minimum air temperature of 9.1 ºC for the month.
Highest Minimum Grass Temperature: 19.9 ºC on 6 April 2021 (0.9 ºC higher than same month in 2020). This coincided with the highest minimum air temperature of 20.4 ºC for the month.
Highest Minimum Grass Temperature Depression: 3.1 ºC on 12 April 2021 with a minimum grass temperature of 8 ºC and an air temperature of 11.1 ºC.
Lowest Minimum Grass Temperature Depression: 0.3 ºC on 3 April 2021 with a minimum grass temperature of 19 ºC and an air temperature of 19.3 ºC.
Monthly mean daily minimum MSL pressure: 1014.6 hPa (0.4 hPa higher than same month in 2020).
Monthly mean daily maximum MSL pressure: 1018.7 hPa (0.3 hPa lower than same month in 2020).
Mean MSL pressure: 1016.7 hPa (0.8 hPa below average, 0.1 hPa higher than same month in 2020).
Lowest MSL pressure: 1004.6 hPa on 10 April 2021 at 3:21 PM. The same month in 2020 saw 1006.4 hPa. This is the second lowest monthly minimum air pressure for April and the lowest since the current record low of 1002 hPa in 2011 on 14 April at 2:58 PM.
Highest MSL pressure: 1024.8 hPa on 14 April 2020 at 8:47 AM. The same month in 2020 saw 1024.8 hPa.
Monthly mean daily minimum relative humidity: 51.8 % (8.6 % higher than same month in 2020 and 3.1 % below average).
Monthly mean daily maximum relative humidity: 95.3 % (0.4 % higher than same month in 2020 and 3.3 % above average). This is the second highest on record for April and the highest since the current record high of 95.6% in 2018.
Mean relative humidity: 73.6 % (4.6 % higher than same month in 2020 and 0.1 % above average).
Lowest relative humidity: 27 % on 21 April 2021 at 3:33 PM (2 % lower than this month in 2020). This is the second lowest monthly minimum humidity for April on record and the lowest since the current record low of 18 % in 2020 on 5 April at 3:02 PM.
Highest relative humidity: 99 % on 24 March 2021 at 4:24 PM (equal to this month in 2020). This is the second highest monthly March maximum humidity on record and the highest since 100% on 18 March 2020 at 7:59 PM.
Monthly mean daily minimum dew point: 12.3 ºC (1.8 ºC below average). This is the second lowest monthly mean minimum dew point for April on record and the lowest since 12.1 ºC in 2017.
Monthly mean daily maximum dew point: 18 ºC (0.6 ºC above average).
Monthly mean dew point: 15.2 ºC (1.2 ºC below average). This is the second lowest monthly mean dew point for April and the lowest since the current record low of 14.7 ºC in 2017.
Lowest dew point: 4.2 ºC on 12 April 2021 at 3:15 AM.
Highest dew point: 22.6 ºC on 4 April 2021 at 3:30 PM.
Highest wind gust: 35 km/hr on 11 April 2021 at 8:00 PM. This is the lowest maximum wind gust on record for April since 19.4 km/hr in 2013 on 3 April at 3:17 PM.
Highest wind speed: 18 km/hr on 11 April 2021 at 3:01 PM (Light Force Wind).
Total Wind Run: 2004.1 km (1031.8 km lower than same month in 2020), 91.9 km below average and 1 % below average.
Mean wind speed: 1.8 km/hr (1 km/hr lower than this month in 2020), 0.9 km/hr below the long term average).
Daily Mean Maximum Wind Gust: 23 km/hr (0.7 km/hr higher than this month in 2020), 2.9 km/hr above average and 30.5 % above average.
Daily Mean Maximum Wind Speed: 10.7 km/hr, 0.6 km/hr lower than this month in 2020), 2.9 km/hr above average and 74.5 % above average. This is the second lowest on record for April and lowest since the current record low of 8.9 km/hr in 2012.
Dominant Direction: SE (SE this month last year).
Rainfall total: 130.1 mm, 36.3 mm above average (138.6 % of long term average), 52.2 mm above the long term median and 308.1 % of the site median. This total is higher than this month in 2020 which was 13.5 mm. Automatic rain gauge was 109.4 mm (-15.9 % of manual gauge).
Highest daily rainfall total: 53.8 mm on 6 April 2021. This is the highest daily total on record for April since 55.2 mm on 29 April 2012.
Number of rain days: 9 days, equal to same month in 2020 and equal to the long-term average.
The year to date total rainfall was 649.4 mm (124.6 mm above average and 20 % above average).
The year to date number of rain days of 59 was 15 days above the long term average.
Highest rainfall rate: 103.8 mm/hr on the 17 April 2021 at 6:37 PM. This is the second highest monthly and daily rainfall rate for April on record and the highest since the current record high of 188.8 mm/hr in 2019 on 20 April at 4:41 PM.
Highest hourly rainfall total: 13 mm on the 6 April 2021 at 12:01 AM.
Light showers with some moderate to heavy falls at the start of the month tending to drizzle and light rain from the 4th and cleared on the 7th with moderate falls on the 6th. Light to moderate showers on the 8th and light showers on the 17th with some moderate to heavy falls. On the 30th were light to moderate thundery showers. Most of the rainfall during the month fell in the first week where the monthly rainfall total on the 7th had reached 114.4 mm.
There was 14 days of morning dew.
Cloudy on the 1st to 3rd.
Cold on the 4th as the temperature rose slowly during the morning and rose slowly in the afternoon.
Cloudy on the 5th and 6th. On the 6th a hot morning was followed by a cool afternoon as the temperature rose slowly during the day.
On the 7th the rain cleared, and cloudy skies eased to cloudy at times.
Sunny or mostly sunny on the 9th, 10th, and 12th to 16th and sunny in afternoon of the 11th.
Hot day on the 10th.
Low humidity in the late afternoon and evening of the 11th.
Mostly cloudy on the 17th with some rainfall.
Mostly sunny or sunny on the 18th to 21st, with low humidity in the late afternoon and evening of the 21st.
A cold morning and day with cloudy skies before low relative humidity in the evening on the 22nd.
Sunny or mostly sunny on the 23rd to 26th.
Cold morning on the 23rd and 24th.
Low humidity early in the day and in the morning on the 23rd.
Cloudy at times with rainfall and became cold in the afternoon on the 30th.
Moist onshore flow extended along the coastline in the first 6 days of the month, with an upper trough that shifted across central and eastern Queensland on the 4th to 6th. A coastal trough and an embedded sub-tropical low pressure system that shifted south along the east Queensland coast between the 4th and 6th before moving away from the 7th brought a period of instability and especially on the 5th and 6th. A new ridge developed following the passage of the trough that brought moist onshore flow on the 8th and more settled weather from the 9th. A warm and stable airmass moved in on the 10th with the passage of a trough. A cooler and drier air mass followed from the 12th with a ridge of high pressure across the state during the remainder of the month that was briefly interrupted by the passage of a surface trough on the 17th with some instability and a trough without instability on the 21st. On the 30th an upper trough and weak coastal trough brought instability in the region.
Long period rainfall totals improved for most periods as compared with March 2021. Many of the long period totals remained slightly above average or above average, though the longer time periods of 24 and 36 month have remained with negative anomalies. 6 monthly rainfall dropped slightly by 13.4 mm to 71.8 mm above average and 9 monthly rainfall improved slightly by 20.2 mm to 86.2 mm above average. 12 monthly rainfall improved by 113.9 mm to 7.3 mm above average. 18 month rainfall improved by 69.5 mm and was 93 mm above average. 24 month and 36 month remained below average which improved by 109.9 mm to 14 mm below average for 24 month rainfall and improved by 60.1 mm to 165 mm below average for 36 month rainfall. 48 month rainfall improved by 135.2 mm to 24.9 mm above average. Compared with the same period in 2020 the long period rainfall totals improved and significantly for some periods but have worsened for 36 and 48 monthly totals.
For April there were 2 existing records exceeded or equalled, along with 6 records that was highest/lowest in at least 5 years.
For more detailed analysis refer to the “Monthly Meteorological Report for April 2021”
Summary of Averages and Extremes for April 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 |
14.7 |
26.5 |
20.6 |
11.8 |
13.0 |
1.6 |
51.8 |
95.3 |
73.6 |
1014.6 |
1018.7 |
1016.7 |
15.2 |
23.0 |
10.7 |
4.3 |
Min |
9.1 |
21.7 |
15.8 |
2.7 |
7.7 |
0.3 |
27 |
86 |
61 |
1004.6 |
1008.5 |
1006.6 |
4.2 |
14.0 |
6.0 |
|
Max |
20.4 |
33.7 |
24.4 |
18.6 |
19.9 |
3.1 |
93 |
99 |
96 |
1022.2 |
1025.7 |
1024.0 |
22.6 |
35.0 |
18.0 |
53.8 |
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
130.1 |
Summary for April 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 |
-0.7 |
+0.1 |
-0.8 |
-1.2 |
+2.9 |
+2.9 |
+36.3 |
138.6 |
Min |
-1.4 |
-3.1 |
|
-1.8 |
|
|
|
|
Max |
+0.0 |
+3.3 |
|
-0.6 |
|
|
+99.9 |
|
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 |
YTD |
18.6 |
28.9 |
9.1 |
36.6 |
23.7 |
-0.5 |
-0.1 |
-0.3 |
649.4 |
+124.6 |
59 |
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 2020, Produced 18/8/21. 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, while. 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”.