Daily Report for 20th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.3 °C (+9.2) 08:46 2.5 °C (+0.4) 11.3 °C (+9.2), 2021 -2.0 °C (-4.1), 2012
Maximum Temperature 15.1 °C (+7.5) 15:51 6.7 °C (-0.6) 17.1 °C (+9.5), 2017 4.2 °C (-3.4), 2013
Mean Temperature 13.1 °C (+8.3) 4.8 °C (-0.1) 13.1 °C, 2021 1.0 °C, 2010
Minimum Humidity 62% 14:51 74% 93%, 2011 44%, 2012
Maximum Humidity 81% 06:00 90% 98%, 2011 78%, 2012
Mean Humidity 72% 83% 95%, 2011 63%, 2012
Minimum Pressure 1002 hPa 16:54 1009 hPa 1030 hPa, 2012 995 hPa, 2010
Maximum Pressure 1006 hPa 00:22 1015 hPa 1033 hPa, 2012 998 hPa, 2010
Mean Pressure 1004 hPa 1012 hPa 1032 hPa, 2012 996 hPa, 2010
Mean Wind Speed 8.8 mph (+3.7) 6.2 mph (+1.1) 10.0 mph, 2020 2.6 mph, 2010
Maximum Wind Speed 17.0 mph 14:06 14.5 mph 24.3 mph, 2020 9.2 mph, 2010
Maximum Gust 26.2 mph 14:14 22.5 mph 34.6 mph, 2020 12.1 mph, 2010
Mean Wind Direction SSW
Rainfall 0.0 mm 39.7 mm (136%) 3.8 mm, 2020
Maximum Hourly Rain n/a 2.2, 2020
Maximum 10-min Rain n/a 0.9, 2020
Maximum Rain Rate n/a 18, 2020
Minimum Dew Point 7.6 °C 14:56 -0.0 °C 7.6 °C, 2021 -6.8 °C, 2012
Maximum Dew Point 8.9 °C 23:55 4.0 °C 12.2 °C, 2017 1.1 °C, 2012
Mean Dew Point 8.2 °C 2.1 °C 9.4 °C, 2017 -2.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.9 °C * 21:10 3.1 °C 10.9 °C, 2021 -2.0 °C, 2012
Day Maximum (09-21) 15.1 °C 15:53 6.5 °C 17.1 °C, 2017 4.2 °C, 2013
Max 10m Temp Rise 0.5 °C 11:00 0.4 °C 0.8 °C, 2009 0.1 °C, 2011
Max 1hr Temp Rise 1.4 °C 11:06 1.1 °C 2.8 °C, 2012 0.3 °C, 2011
Max 1hr Hum Rise 3% 05:05 6% 13%, 2014 1%, 2011
Max 10m Temp Fall 0.2 °C 04:15 0.3 °C 0.9 °C, 2014 0.1 °C, 2011
Max 1hr Temp Fall 0.7 °C 17:54 0.9 °C 2.8 °C, 2020 0.3 °C, 2011
Max 1hr Hum Fall 6% 11:51 6% 21%, 2009 1%, 2011
Max 10m Wind Speed 13.6 mph 14:29 11.4 mph 16.5 mph, 2020 5.7 mph, 2010
Minimum Feels-like 11.6 °C 08:33 -2.3 °C 11.6 °C, 2021 -5.7 °C, 2012
Maximum Feels-like 15.5 °C 15:47 6.2 °C 19.4 °C, 2017 3.3 °C, 2013
Mean Feels-like 13.6 °C 2.1 °C 13.6 °C, 2017 -0.6 °C, 2013
Air-frost Hrs 0 hrs 6 hrs 10 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.8 °C (-1.7) 4.3 °C (-0.9) 10.3 °C (+4.8), 2012 1.5 °C (-4.0), 2011
Humidity Range 19% 16% 44%, 2009 5%, 2011
Pressure Range 4 hPa 7 hPa 18 hPa, 2020 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [11%]24 hrs (46%) [14%] 6 [65%], 2010 0 [0%], 2011
Wet Hours 054 hrs (145%) [11%] 6, 2016 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 4.5 °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 are initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose