Daily Report for 23rd February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.4 °C (+4.0) 05:04 3.1 °C (+1.0) 9.9 °C (+7.5), 2012 -0.6 °C (-3.0), 2018
Maximum Temperature 13.6 °C (+5.5) 15:47 7.6 °C (+0.2) 16.0 °C (+7.9), 2012 1.7 °C (-6.4), 2013
Mean Temperature 10.6 °C (+4.8) 5.6 °C (+0.6) 12.9 °C, 2012 0.7 °C, 2013
Minimum Humidity 61% 14:01 74% 84%, 2010 47%, 2017
Maximum Humidity 92% 02:32 90% 98%, 2010 76%, 2013
Mean Humidity 78% 83% 94%, 2010 66%, 2013
Minimum Pressure 1023 hPa 12:57 1009 hPa 1033 hPa, 2019 990 hPa, 2015
Maximum Pressure 1025 hPa 21:40 1016 hPa 1036 hPa, 2019 992 hPa, 2015
Mean Pressure 1024 hPa 1012 hPa 1034 hPa, 2019 990 hPa, 2015
Mean Wind Speed 9.8 mph (+4.7) 6.0 mph (+0.9) 12.9 mph, 2017 2.1 mph, 2019
Maximum Wind Speed 20.5 mph 17:10 14.5 mph 27.4 mph, 2017 8.5 mph, 2019
Maximum Gust 30.8 mph 15:27 22.5 mph 46.1 mph, 2017 11.5 mph, 2019
Mean Wind Direction SW
Rainfall 0.2 mm 40.1 mm (119%) 3.5 mm, 2011
Maximum Hourly Rain 0.2 mm 2.6 mm, 2017
Maximum 10-min Rain 0.2 mm 2.6 mm, 2017
Maximum Rain Rate n/a 48, 2017
Minimum Dew Point 5.1 °C 04:58 0.7 °C 7.9 °C, 2012 -7.0 °C, 2013
Maximum Dew Point 9.1 °C 20:29 4.7 °C 11.5 °C, 2012 -2.9 °C, 2013
Mean Dew Point 6.8 °C 2.8 °C 10.2 °C, 2012 -5.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.4 °C 05:10 3.7 °C 9.7 °C, 2017 -0.6 °C, 2018
Day Maximum (09-21) 13.6 °C 15:39 7.4 °C 16.0 °C, 2012 1.7 °C, 2013
Max 10m Temp Rise 0.5 °C 08:25 0.4 °C 0.7 °C, 2019 0.2 °C, 2010
Max 1hr Temp Rise 1.7 °C 12:03 1.2 °C 2.0 °C, 2018 0.6 °C, 2010
Max 1hr Hum Rise 6% 17:28 6% 11%, 2013 4%, 2010
Max 10m Temp Fall 0.3 °C 17:06 0.3 °C 0.9 °C, 2009 0.1 °C, 2011
Max 1hr Temp Fall 0.8 °C 01:37 0.9 °C 2.6 °C, 2019 0.4 °C, 2011
Max 1hr Hum Fall 9% 10:13 7% 18%, 2020 4%, 2011
Max 10m Wind Speed 17.2 mph 15:45 11.5 mph 22.0 mph, 2017 6.2 mph, 2019
Minimum Feels-like 2.2 °C 05:18 -1.3 °C 7.1 °C, 2012 -5.6 °C, 2013
Maximum Feels-like 14.4 °C 21:09 7.2 °C 17.8 °C, 2012 -0.5 °C, 2013
Mean Feels-like 9.7 °C 3.2 °C 14.2 °C, 2012 -3.2 °C, 2013
Air-frost Hrs 0 hrs 6 hrs 5 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.2 °C (+1.5) 4.5 °C (-0.8) 9.7 °C (+4.1), 2019 2.0 °C (-3.7), 2013
Humidity Range 31% 16% 40%, 2015 14%, 2010
Pressure Range 2 hPa 7 hPa 17 hPa, 2017 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [64%]30 hrs (49%) [15%] 7.5 [80%], 2019 0 [0%], 2010
Wet Hours 156 hrs (131%) [10%] 5, 2011 , 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