Daily Report for 22nd February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.9 °C (+4.6) 06:49 3.0 °C (+0.9) 10.9 °C (+8.6), 2017 -0.8 °C (-3.1), 2015
Maximum Temperature 11.6 °C (+3.7) 12:26 7.3 °C (-0.0) 14.8 °C (+6.9), 2019 1.4 °C (-6.5), 2013
Mean Temperature 9.5 °C (+4.2) 5.4 °C (+0.4) 12.2 °C, 2017 0.6 °C, 2013
Minimum Humidity 82% 11:26 74% 94%, 2010 49%, 2014
Maximum Humidity 93% 22:05 90% 98%, 2010 66%, 2013
Mean Humidity 88% 83% 97%, 2010 57%, 2013
Minimum Pressure 1011 hPa 00:07 1009 hPa 1032 hPa, 2019 983 hPa, 2010
Maximum Pressure 1023 hPa 23:54 1015 hPa 1036 hPa, 2019 991 hPa, 2010
Mean Pressure 1016 hPa 1012 hPa 1035 hPa, 2019 987 hPa, 2010
Mean Wind Speed 0.6 mph (-4.5) 5.8 mph (+0.7) 13.0 mph, 2020 0.6 mph, 2021
Maximum Wind Speed 8.2 mph 08:53 14.3 mph 24.0 mph, 2020 8.2 mph, 2021
Maximum Gust 11.4 mph 08:53 22.1 mph 39.2 mph, 2020 10.5 mph, 2011
Mean Wind Direction SW
Rainfall 0.2 mm 39.9 mm (124%) 13.0 mm, 2010
Maximum Hourly Rain 0.2 mm 3.0 mm, 2010
Maximum 10-min Rain 0.2 mm 0.8 mm, 2010
Maximum Rain Rate n/a 18, 2015
Minimum Dew Point 5.2 °C 06:36 0.5 °C 7.7 °C, 2017 -8.2 °C, 2013
Maximum Dew Point 9.1 °C 17:59 4.5 °C 10.0 °C, 2012 -5.0 °C, 2013
Mean Dew Point 7.6 °C 2.7 °C 8.6 °C, 2017 -6.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.9 °C 06:49 3.6 °C 11.2 °C, 2017 -0.8 °C, 2015
Day Maximum (09-21) 11.6 °C 12:26 7.1 °C 14.8 °C, 2019 1.4 °C, 2013
Max 10m Temp Rise 0.7 °C 08:08 0.4 °C 1.3 °C, 2009 0.1 °C, 2010
Max 1hr Temp Rise 2.5 °C 08:43 1.1 °C 2.5 °C, 2019 0.4 °C, 2010
Max 1hr Hum Rise 4% 13:09 6% 14%, 2015 1%, 2010
Max 10m Temp Fall 0.3 °C 04:15 0.3 °C 1.3 °C, 2009 0.1 °C, 2011
Max 1hr Temp Fall 1.0 °C 13:57 0.9 °C 2.0 °C, 2019 0.3 °C, 2011
Max 1hr Hum Fall 7% 08:48 6% 20%, 2016 1%, 2010
Max 10m Wind Speed 6.4 mph 09:06 11.3 mph 18.4 mph, 2020 5.5 mph, 2011
Minimum Feels-like 6.3 °C 07:58 -1.5 °C 11.6 °C, 2017 -6.3 °C, 2013
Maximum Feels-like 12.4 °C 12:22 6.9 °C 15.9 °C, 2019 -1.1 °C, 2013
Mean Feels-like 9.8 °C 2.9 °C 12.9 °C, 2017 -4.0 °C, 2013
Air-frost Hrs 0 hrs 6 hrs 3 hrs, 2015 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.7 °C (-0.9) 4.3 °C (-0.9) 10.0 °C (+4.4), 2015 1.5 °C (-4.1), 2013
Humidity Range 11% 16% 42%, 2016 4%, 2010
Pressure Range 12 hPa 7 hPa 20 hPa, 2015 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]24 hrs (41%) [12%] 7.4 [79%], 2019 0 [0%], 2010
Wet Hours 155 hrs (135%) [10%] 10, 2010 , 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