Daily Report for 20th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.0 °C (+0.9) 03:52 5.9 °C (+0.1) 13.9 °C (+7.8), 2018 1.4 °C (-4.7), 2013
Maximum Temperature 17.3 °C (+2.7) 14:55 15.0 °C (+1.1) 25.9 °C (+11.3), 2018 13.0 °C (-1.6), 2012
Mean Temperature 11.8 °C (+1.8) 10.4 °C (+0.6) 20.0 °C, 2018 7.8 °C, 2013
Minimum Humidity 40% 13:37 50% 75%, 2014 33%, 2011
Maximum Humidity 91% 04:52 88% 95%, 2014 72%, 2017
Mean Humidity 66% 71% 90%, 2014 54%, 2011
Minimum Pressure 1016 hPa 23:07 1012 hPa 1032 hPa, 2017 990 hPa, 2012
Maximum Pressure 1019 hPa 07:17 1020 hPa 1037 hPa, 2017 995 hPa, 2012
Mean Pressure 1017 hPa 1016 hPa 1035 hPa, 2017 992 hPa, 2012
Mean Wind Speed 4.8 mph (-0.1) 4.8 mph (-0.1) 7.9 mph, 2020 1.0 mph, 2021
Maximum Wind Speed 11.9 mph 12:10 13.5 mph 18.4 mph, 2020 8.9 mph, 2021
Maximum Gust 20.5 mph 01:12 21.8 mph 27.6 mph, 2020 11.4 mph, 2021
Mean Wind Direction ENE
Rainfall 0.0 mm 14.9 mm (53%) 8.0 mm, 2012
Maximum Hourly Rain n/a 4.9, 2012
Maximum 10-min Rain n/a 2.6, 2012
Maximum Rain Rate n/a 30, 2012
Minimum Dew Point 2.8 °C 13:37 2.3 °C 9.6 °C, 2018 -3.0 °C, 2010
Maximum Dew Point 8.7 °C 10:56 7.5 °C 14.1 °C, 2018 4.2 °C, 2013
Mean Dew Point 5.2 °C 5.0 °C 11.5 °C, 2018 -0.1 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.0 °C 03:53 6.0 °C 13.9 °C, 2018 1.4 °C, 2013
Day Maximum (09-21) 17.3 °C 14:56 15.0 °C 25.9 °C, 2018 13.0 °C, 2012
Max 10m Temp Rise 0.6 °C 09:03 0.7 °C 1.0 °C, 2013 0.4 °C, 2014
Max 1hr Temp Rise 2.6 °C 09:39 2.4 °C 4.2 °C, 2013 1.6 °C, 2014
Max 1hr Hum Rise 7% 23:38 10% 19%, 2012 4%, 2010
Max 10m Temp Fall 0.4 °C 13:24 0.8 °C 1.7 °C, 2012 0.4 °C, 2014
Max 1hr Temp Fall 1.4 °C 20:42 1.8 °C 3.6 °C, 2012 1.3 °C, 2017
Max 1hr Hum Fall 14% 11:21 11% 19%, 2013 1%, 2017
Max 10m Wind Speed 9.0 mph 13:08 10.4 mph 14.4 mph, 2020 5.7 mph, 2021
Minimum Feels-like 2.8 °C 05:38 3.5 °C 15.1 °C, 2018 0.1 °C, 2013
Maximum Feels-like 17.3 °C 14:55 15.6 °C 28.6 °C, 2018 13.0 °C, 2012
Mean Feels-like 10.9 °C 9.9 °C 22.0 °C, 2018 7.2 °C, 2012
Air-frost Hrs 0 hrs 0.3 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.3 °C (+1.8) 9.1 °C (+0.9) 15.3 °C (+6.8), 2011 6.7 °C (-1.8), 2014
Humidity Range 51% 39% 56%, 2013 20%, 2014
Pressure Range 3 hPa 8 hPa 11 hPa, 2014 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [63%]102 hrs (97%) [42%] 13 [102%], 2019 0 [0%], 2014
Wet Hours 016 hrs (52%) [3.3%] 5, 2014 0, 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 12.5 °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