Daily Report for 24th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.1 °C (+8.7) 07:29 3.5 °C (+1.3) 11.1 °C (+8.7), 2021 -2.1 °C (-4.5), 2016
Maximum Temperature 15.8 °C (+7.6) 13:12 7.9 °C (+0.5) 15.8 °C (+7.6), 2021 2.0 °C (-6.2), 2013
Mean Temperature 13.1 °C (+8.1) 5.9 °C (+0.9) 13.1 °C, 2021 1.0 °C, 2013
Minimum Humidity 69% 10:23 74% 88%, 2010 41%, 2015
Maximum Humidity 81% 05:00 90% 98%, 2010 70%, 2017
Mean Humidity 75% 83% 96%, 2010 60%, 2017
Minimum Pressure 1022 hPa 16:50 1010 hPa 1034 hPa, 2019 986 hPa, 2010
Maximum Pressure 1024 hPa 07:06 1016 hPa 1038 hPa, 2019 993 hPa, 2010
Mean Pressure 1023 hPa 1013 hPa 1036 hPa, 2019 990 hPa, 2010
Mean Wind Speed 9.6 mph (+4.5) 6.2 mph (+1.1) 9.6 mph, 2021 0.7 mph, 2016
Maximum Wind Speed 17.9 mph 11:05 14.7 mph 21.9 mph, 2020 5.2 mph, 2016
Maximum Gust 26.2 mph 00:46 22.6 mph 33.4 mph, 2020 8.4 mph, 2016
Mean Wind Direction SW
Rainfall 0.0 mm 40.1 mm (114%) 6.1 mm, 2020
Maximum Hourly Rain n/a 1.8, 2020
Maximum 10-min Rain n/a 0.5, 2010
Maximum Rain Rate n/a 18, 2020
Minimum Dew Point 6.9 °C 00:32 1.0 °C 6.9 °C, 2021 -6.3 °C, 2016
Maximum Dew Point 10.9 °C 12:38 4.9 °C 10.9 °C, 2021 -2.6 °C, 2013
Mean Dew Point 8.8 °C 3.1 °C 8.8 °C, 2021 -3.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.1 °C 07:33 4.0 °C 11.1 °C, 2021 -2.1 °C, 2016
Day Maximum (09-21) 15.8 °C 13:00 7.8 °C 15.8 °C, 2021 2.0 °C, 2013
Max 10m Temp Rise 0.5 °C 08:44 0.4 °C 0.7 °C, 2014 0.2 °C, 2013
Max 1hr Temp Rise 2.0 °C 08:56 1.2 °C 2.8 °C, 2016 0.4 °C, 2013
Max 1hr Hum Rise 6% 01:28 6% 13%, 2020 2%, 2009
Max 10m Temp Fall 0.3 °C 14:00 0.3 °C 0.5 °C, 2009 0.1 °C, 2013
Max 1hr Temp Fall 0.9 °C 01:07 0.9 °C 2.2 °C, 2016 0.3 °C, 2013
Max 1hr Hum Fall 9% 08:54 7% 19%, 2016 5%, 2009
Max 10m Wind Speed 14.1 mph 12:05 11.6 mph 16.0 mph, 2020 3.4 mph, 2016
Minimum Feels-like 11.3 °C 07:42 -0.8 °C 11.3 °C, 2021 -7.0 °C, 2018
Maximum Feels-like 17.5 °C 12:43 7.7 °C 17.5 °C, 2021 -0.4 °C, 2013
Mean Feels-like 13.9 °C 3.7 °C 13.9 °C, 2021 -2.9 °C, 2013
Air-frost Hrs 0 hrs 5 hrs 10 hrs, 2016 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.7 °C (-1.1) 4.5 °C (-0.8) 12.2 °C (+6.4), 2019 1.7 °C (-4.1), 2013
Humidity Range 12% 16% 49%, 2019 10%, 2010
Pressure Range 2 hPa 6 hPa 22 hPa, 2015 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [21%]32 hrs (50%) [15%] 9.4 [100%], 2018 0 [0%], 2009
Wet Hours 056 hrs (126%) [9.7%] 8, 2020 , 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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