December 2020 weather review

The review of the weather at Ferny Grove during December 2020 is now available.

in December 2020 overnight temperatures were over 1 ºC above average and was the highest for December in 11 years. Daytime temperatures were close to average and the lowest in 5 years. Minimum temperatures in December were predominately above average during the month and were near or below average in the middle of the month and at the end of the month. Maximum temperatures in December saw two periods of warm days at the start of the month and between the 18th and 23rd, as well as near average or below average temperatures. The first 8 days of the month saw warm days and nights that were up 7 ºC above average during a low to severe intensity heatwave .

Rainfall in December was above average with a total of 145.9 mm (112.9% of the long term average). This is the highest for December since the current record high of 450.1 mm in 2010. The annual rainfall total remained above average at 23.3% above the long term average and was the highest since 1263.6 mm in 2015. Most rainfall in the month occurred between the 7th and 18th during an active period of drizzle, showers, rain, and mild thunderstorms. The first 8 days of the month was dry and later in the month there were some drizzle and light showers on some days. The highest daily total rainfall on the 14th of 70.1 mm was the highest for December since 82 mm on 28 December 1999. This rainfall was a result of light to moderate rain from the evening of the 13th to early on the 14th that was associated with a coastal low pressure system that brought severe weather conditions to coastal areas of south-east Queensland.

Most long period rainfall totals continue to remain below or well below average, that improved for many of these periods. 6 monthly rainfall improved a little to 18.3 mm below average, while 9 monthly rainfall deteriorated from 171.9 mm above average to 52.7 mm below average. 12 month rainfall improved by 91 mm to 94.2 mm above average and 18 month rainfall improved by 100 mm at 38 mm below average. 24 month to 48 month rainfall was between 156.7 mm below average for 48 month rainfall and 366.1 mm below average for 24 month rainfall. Compared with the same period in the previous year these periods improved, and the greatest improvement was 12 monthly rainfall that improved by 564 mm.

The summary containing the key information can be found here.

The full report of more detailed analysis is available here.

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