Daily Report for 20th February 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.9 °C (+2.0) 23:56 5.2 °C (+2.3) 11.3 °C (+8.4), 2021 -2.0 °C (-4.9), 2012
Maximum Temperature 12.0 °C (+3.8) 13:09 10.7 °C (+2.7) 17.1 °C (+8.9), 2017 4.2 °C (-4.0), 2013
Mean Temperature 9.7 °C (+2.9) 8.2 °C (+2.5) 13.1 °C, 2021 1.0 °C, 2010
Minimum Humidity 71% 21:39 70% 93%, 2011 44%, 2012
Maximum Humidity 91% 18:50 90% 98%, 2011 78%, 2012
Mean Humidity 84% 81% 95%, 2011 63%, 2012
Minimum Pressure 994 hPa 18:17 1008 hPa 1030 hPa, 2012 994 hPa, 2022
Maximum Pressure 1012 hPa 00:02 1020 hPa 1033 hPa, 2012 998 hPa, 2010
Mean Pressure 1004 hPa 1014 hPa 1032 hPa, 2012 996 hPa, 2010
Mean Wind Speed 13.3 mph (+8.2) 8.5 mph (+3.4) 13.3 mph, 2022 2.6 mph, 2010
Maximum Wind Speed 26.9 mph 18:09 19.4 mph 26.9 mph, 2022 9.2 mph, 2010
Maximum Gust 38.8 mph 19:01 32.6 mph 38.8 mph, 2022 12.1 mph, 2010
Mean Wind Direction WSW
Rainfall 6.7 mm 44.3 mm (138%) 6.7 mm, 2022
Maximum Hourly Rain 6.2 mm 19:22 6.2 mm, 2022
Maximum 10-min Rain 3.4 mm 19:00 3.4 mm, 2022
Maximum Rain Rate 60 mm/h 18:53 60 mm/h, 2022
Minimum Dew Point 0.4 °C 23:29 2.2 °C 7.6 °C, 2021 -6.8 °C, 2012
Maximum Dew Point 9.9 °C 18:50 7.8 °C 12.2 °C, 2017 1.1 °C, 2012
Mean Dew Point 7.1 °C 5.1 °C 9.4 °C, 2017 -2.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.3 °C * 22:12 5.9 °C 10.9 °C, 2021 -2.0 °C, 2012
Day Maximum (09-21) 12.0 °C 14:16 10.5 °C 17.1 °C, 2017 4.2 °C, 2013
Max 10m Temp Rise 0.3 °C 02:21 0.4 °C 0.8 °C, 2009 0.1 °C, 2011
Max 1hr Temp Rise 1.1 °C 12:28 1.4 °C 2.8 °C, 2012 0.3 °C, 2011
Max 1hr Hum Rise 5% 18:34 7% 13%, 2014 1%, 2011
Max 10m Temp Fall 2.9 °C 19:01 0.7 °C 2.9 °C, 2022 0.1 °C, 2011
Max 1hr Temp Fall 4.2 °C 19:27 1.6 °C 4.2 °C, 2022 0.3 °C, 2011
Max 1hr Hum Fall 9% 21:27 8% 21%, 2009 1%, 2011
Max 10m Wind Speed 21.5 mph 19:07 15.0 mph 21.5 mph, 2022 5.7 mph, 2010
Minimum Feels-like -0.9 °C 23:46 0.7 °C 11.6 °C, 2021 -5.7 °C, 2012
Maximum Feels-like 13.1 °C 13:08 10.7 °C 19.4 °C, 2017 3.3 °C, 2013
Mean Feels-like 8.5 °C 6.1 °C 13.6 °C, 2017 -0.6 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 10 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.1 °C (+1.7) 5.5 °C (+0.4) 10.3 °C (+4.9), 2012 1.5 °C (-3.9), 2011
Humidity Range 20% 20% 44%, 2009 5%, 2011
Pressure Range 18 hPa 11 hPa 18 hPa, 2022 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]43 hrs (79%) [25%] 6 [65%], 2010 0 [0%], 2011
Wet Hours 3
[Mean rain rate: 2.2 mm/h]
52 hrs (140%) [11%] 6, 2016 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 6.5 °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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Webcam Summary of Cloud Conditions

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