May 2021 weather review

The review of the weather at Ferny Grove during May 2021 is now available.

In May 2021 overnight and daytime temperatures were close to average. Daytime temperatures was the lowest for May in 6 years. 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. 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.

Rainfall for May was close to average but above the long term median with a total of 99.5 mm (96.6% of the long term average and 220.4% of the site median). On the 1st and 2nd were showers with some moderate to heavy falls. Further rainfall occurred on the 4th and 5th with light showers tending to rain after a mild thunderstorm with brief heavy falls on the 5th. Overnight on the 11th and 12th was light to moderate thundery rain with a thunderstorm. In the afternoon of the 12th was a severe thunderstorm with fierce electrical activity with 20 mm of rainfall occurring in 12 minutes. Almost all of the rainfall fell in the first half of the month.

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, 9 monthly rainfall improved by 23.8 mm to 110 mm above average and 12 monthly rainfall improved by 88.8 mm to 96.1 mm above average. 18 month rainfall improved by 72.6 mm to 165.6 mm above average. 24 monthly rainfall returned to being in the positive from 14 mm below average to 9.8 mm above average. 36 month was the only period that was below average being 165 mm below average 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. 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.

The summary containing the key information can be found here.

The full report of more detailed analysis is available here.

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