Daily Report for 21st August 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.8 °C (-0.3) 06:10 14.6 °C (+1.1) 19.0 °C (+5.9), 2010 7.7 °C (-5.4), 2014
Maximum Temperature 19.8 °C (-2.4) 16:05 22.8 °C (+0.3) 26.0 °C (+3.8), 2018 18.4 °C (-3.8), 2014
Mean Temperature 15.5 °C (-1.3) 18.3 °C (+0.7) 21.7 °C, 2018 13.5 °C, 2014
Minimum Humidity 44% 15:42 54% 79%, 2017 34%, 2013
Maximum Humidity 86% 06:47 91% 91%, 2010 83%, 2020
Mean Humidity 69% 75% 85%, 2010 57%, 2013
Minimum Pressure 1018 hPa 00:06 1015 hPa 1026 hPa, 2019 1000 hPa, 2020
Maximum Pressure 1022 hPa 22:28 1019 hPa 1029 hPa, 2019 1010 hPa, 2020
Mean Pressure 1020 hPa 1017 hPa 1027 hPa, 2019 1004 hPa, 2020
Mean Wind Speed 4.8 mph (+0.8) 3.6 mph (-0.4) 12.4 mph, 2020 1.9 mph, 2017
Maximum Wind Speed 13.0 mph 9.9 mph 28.6 mph, 2020 7.2 mph, 2017
Maximum Gust 23.0 mph 15:36 14.6 mph 43.8 mph, 2020 10.5 mph, 2017
Mean Wind Direction SW
Rainfall 0.5 mm 38.3 mm (107%) 4.3 mm, 2017
Maximum Hourly Rain 0.5 mm 13:35 1.3 mm, 2017
Maximum 10-min Rain 0.3 mm 13:00 0.3 mm, 2009
Maximum Rain Rate n/a 13:35 3, 2017
Minimum Dew Point 7.0 °C 15:42 10.8 °C 16.8 °C, 2010 4.2 °C, 2014
Maximum Dew Point 11.7 °C 11:59 15.9 °C 18.3 °C, 2010 9.1 °C, 2014
Mean Dew Point 9.6 °C 13.4 °C 17.6 °C, 2010 6.3 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.8 °C 14.6 °C 19.0 °C, 2010 7.7 °C, 2014
Day Maximum (09-21) 19.8 °C 22.8 °C 26.0 °C, 2018 18.4 °C, 2014
Max 10m Temp Rise 1.1 °C 14:13 0.5 °C 1.1 °C, 2009 0.2 °C, 2017
Max 1hr Temp Rise 3.8 °C 15:03 1.5 °C 3.8 °C, 2009 0.8 °C, 2017
Max 1hr Hum Rise 16% 13:51 7% 18%, 2016 3%, 2017
Max 10m Temp Fall 1.2 °C 13:09 0.5 °C 1.2 °C, 2009 0.1 °C, 2017
Max 1hr Temp Fall 2.7 °C 13:43 1.3 °C 2.7 °C, 2009 0.4 °C, 2017
Max 1hr Hum Fall 23% 15:15 7% 23%, 2009 2%, 2017
Max 10m Wind Speed 9.8 mph 13:09 6.9 mph 19.2 mph, 2020 5.9 mph, 2017
Minimum Feels-like 14.3 °C 06:05 16.1 °C 24.3 °C, 2010 6.0 °C, 2014
Maximum Feels-like 20.5 °C 16:07 25.3 °C 31.2 °C, 2018 18.4 °C, 2014
Mean Feels-like 16.7 °C 20.4 °C 26.5 °C, 2018 13.6 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.0 °C (-2.1) 8.2 °C (-0.8) 14.1 °C (+5.0), 2013 3.1 °C (-6.0), 2010
Humidity Range 42% 37% 50%, 2013 7%, 2017
Pressure Range 4 hPa 4 hPa 12 hPa, 2016 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [38%]100 hrs (80%) [35%] 11 [85%], 2013 0 [0%], 2017
Wet Hours 1.5
[Mean rain rate: 0.3 mm/h]
15 hrs (59%) [3%] 7, 2017 0, 2010
Cloud Cover not available
Events None
Comments Light 12-14 (13-1330 break) Rain (Heavy 13)
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs, Wet hrs, Cloud cover and Events are based on manual equipment/observations (entered with a delay of 1-10 days); their reliablity is questionable and they are provided for interest only.
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Daily Graph of Conditions

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