August 2021 was cooler than average (15.61°C versus an average of 15.71), drier than average (38.60 mm versus an average total of 52.95) and calmer than average (a wind run of 1712 miles versus an average of 2321).
Temperatures in the month were slightly below average, mainly due to above average minimum temperatures. The Highest temperature in the month was 22.9°C at 15:40 on the 23rd, this equalled the lowest maximum temperaure set in 2014. The lowest temperature in the month was 8.6°C set at 06:01 on the 3rd, this equalled the highest minimum temperature set in 2013. The average temperature in the month was 15.6°C, 0.1°C below the mean. The average daily high temperature was 19.8°C, 0.4 below the mean, while the average daily low was 12.3°C, 0.5°C above the mean.
The warmest day was the 20th, with an average temperature of 17.7°C The coldest day was the 31st with an average temperature of 13.2°C. There wera no frost days in the month.The sunniest day was the 12th with 9.0 hours of sunshine.There were 159.6 hours of sun in the month, the least sunniest August so far recorded and 28.4 hours below the mean.
Rainfall in the month was 38.6 millimetres recorded on 17 days, 13.1 millimetres below the monthly mean. The yearly total was 411.4 millimetres, 112% of the average for the end of August. The wettest day was the 6th with 10.4 millimetres. The highest rain rate of 109.8 millimetres per hour was recorded at 12:13 on the 6th.. There was no snow recorded in the month.
The highest barometric pressure of 1032.3 millibars was at 23:48 on the 31st, the highest ever recorded in August. The lowest pressure was 991.6 millibars at 07:19 on the 6th. The average pressure in the month was 1015.2 millibars. The highest humidity was 96% and the monthly average humidity was 84%. The lowest humidity was 50% at 14:51 on the 13th.
Wind speeds were again lower than average, with the highest wind gust speed of 24 mph being recorded at 15:32 on the 13th. The maximum wind speed was 14 mph at 15:33 on the 6th. The wind run was 1711.8 miles, 707.9 miles below the average for the month. The average gust speed in the month was 3.8 mph, and the average wind speed was 2.3 mph. The predominant direction was southerly (183°).
The maximum high solar radiation recorded at 12:26 on the 9th was 1106 w/m². The average solar radiation for the month was 143 w/m². The highest U.V. Index was 5.6 recorded at 12:58 on the 11th.