Daily Report for 19th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.5 °C (+3.5) 00:29 2.0 °C (-0.1) 6.9 °C (+4.9), 2018 -2.2 °C (-4.2), 2013
Maximum Temperature 11.9 °C (+4.4) 23:44 6.3 °C (-1.0) 12.1 °C (+4.6), 2017 5.7 °C (-1.8), 2012
Mean Temperature 8.6 °C (+3.9) 4.4 °C (-0.5) 8.7 °C, 2017 2.2 °C, 2010
Minimum Humidity 80% 23:44 75% 88%, 2018 40%, 2012
Maximum Humidity 89% 05:04 91% 98%, 2010 76%, 2012
Mean Humidity 84% 84% 96%, 2011 61%, 2012
Minimum Pressure 1006 hPa 23:45 1009 hPa 1026 hPa, 2009 987 hPa, 2010
Maximum Pressure 1011 hPa 01:40 1016 hPa 1033 hPa, 2012 996 hPa, 2010
Mean Pressure 1009 hPa 1012 hPa 1027 hPa, 2009 992 hPa, 2010
Mean Wind Speed 9.3 mph (+4.2) 6.1 mph (+1.0) 9.3 mph, 2021 1.4 mph, 2013
Maximum Wind Speed 19.4 mph 12:13 14.3 mph 19.4 mph, 2021 7.6 mph, 2013
Maximum Gust 28.5 mph 12:17 22.3 mph 28.5 mph, 2021 10.9 mph, 2013
Mean Wind Direction SSW
Rainfall 0.0 mm 39.7 mm (143%) 11.2 mm, 2011
Maximum Hourly Rain n/a 2.5, 2011
Maximum 10-min Rain n/a 0.5, 2011
Maximum Rain Rate n/a 18, 2015
Minimum Dew Point 3.2 °C 00:34 -0.4 °C 5.4 °C, 2018 -8.1 °C, 2012
Maximum Dew Point 8.8 °C 22:53 3.7 °C 9.6 °C, 2018 -1.2 °C, 2012
Mean Dew Point 6.1 °C 1.8 °C 7.5 °C, 2018 -4.4 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.5 °C 02:05 2.7 °C 6.9 °C, 2018 -2.2 °C, 2013
Day Maximum (09-21) * 10.9 °C * 20:56 6.1 °C 12.1 °C, 2017 5.7 °C, 2012
Max 10m Temp Rise 0.3 °C 08:21 0.3 °C 0.8 °C, 2013 0.2 °C, 2011
Max 1hr Temp Rise 1.2 °C 08:43 1.1 °C 3.5 °C, 2013 0.8 °C, 2011
Max 1hr Hum Rise 3% 02:50 6% 12%, 2016 3%, 2011
Max 10m Temp Fall 0.2 °C 16:46 0.3 °C 0.6 °C, 2012 0.1 °C, 2011
Max 1hr Temp Fall 0.4 °C 17:25 0.9 °C 2.8 °C, 2013 0.3 °C, 2011
Max 1hr Hum Fall 4% 23:30 6% 22%, 2010 1%, 2011
Max 10m Wind Speed 15.3 mph 11:29 11.3 mph 15.3 mph, 2021 6.3 mph, 2018
Minimum Feels-like 1.0 °C 04:41 -3.1 °C 3.9 °C, 2018 -4.3 °C, 2010
Maximum Feels-like 12.6 °C 23:35 5.7 °C 12.6 °C, 2021 4.6 °C, 2012
Mean Feels-like 6.6 °C 1.5 °C 7.9 °C, 2017 -0.2 °C, 2010
Air-frost Hrs 0 hrs 7 hrs 6 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.4 °C (+0.9) 4.3 °C (-0.9) 11.0 °C (+5.5), 2013 3.3 °C (-2.2), 2011
Humidity Range 9% 16% 45%, 2013 8%, 2018
Pressure Range 5 hPa 7 hPa 20 hPa, 2015 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]23 hrs (46%) [14%] 9.1 [100%], 2013 0 [0%], 2011
Wet Hours 054 hrs (153%) [12%] 12, 2015 , 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