Daily Report for 23rd May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.7 °C (+1.8) 23:55 10.6 °C (+2.0) 12.8 °C (+2.9), 2012 5.4 °C (-4.5), 2021
Maximum Temperature 19.1 °C (+0.6) 17:30 19.8 °C (+2.4) 29.1 °C (+10.6), 2010 11.0 °C (-7.5), 2013
Mean Temperature 15.1 °C (+1.2) 15.1 °C (+2.2) 19.4 °C, 2010 8.1 °C, 2013
Minimum Humidity 53% 17:33 54% 64%, 2018 33%, 2009
Maximum Humidity 88% 23:57 90% 92%, 2010 71%, 2014
Mean Humidity 74% 74% 79%, 2021 51%, 2019
Minimum Pressure 1001 hPa 18:30 1017 hPa 1024 hPa, 2015 1001 hPa, 2022
Maximum Pressure 1009 hPa 00:00 1023 hPa 1028 hPa, 2020 1008 hPa, 2014
Mean Pressure 1004 hPa 1020 hPa 1024 hPa, 2015 1004 hPa, 2022
Mean Wind Speed 3.1 mph (-1.6) 3.6 mph (-1.1) 10.8 mph, 2020 2.4 mph, 2010
Maximum Wind Speed 11.6 mph 18:16 11.8 mph 23.3 mph, 2020 6.4 mph, 2012
Maximum Gust 18.2 mph 18:16 18.5 mph 39.2 mph, 2020 8.7 mph, 2012
Mean Wind Direction WNW
Rainfall 0.5 mm 19.3 mm (57%) 4.6 mm, 2021
Maximum Hourly Rain 0.5 mm 23:36 2.0 mm, 2015
Maximum 10-min Rain 0.3 mm 23:36 1.0 mm, 2021
Maximum Rain Rate 0.4 mm/h 23:36 14 mm/h, 2021
Minimum Dew Point 8.9 °C 04:15 7.6 °C 10.3 °C, 2012 -2.2 °C, 2013
Maximum Dew Point 13.1 °C 10:41 12.5 °C 16.8 °C, 2012 2.8 °C, 2013
Mean Dew Point 10.5 °C 10.1 °C 13.7 °C, 2012 0.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 12.8 °C * 04:16 10.7 °C 13.0 °C, 2015 5.4 °C, 2021
Day Maximum (09-21) 19.1 °C 17:31 19.8 °C 29.1 °C, 2010 11.0 °C, 2013
Max 10m Temp Rise 0.6 °C 09:34 0.6 °C 1.0 °C, 2013 0.5 °C, 2010
Max 1hr Temp Rise 2.1 °C 09:40 2.3 °C 2.9 °C, 2012 1.7 °C, 2014
Max 1hr Hum Rise 20% 19:36 11% 21%, 2013 6%, 2018
Max 10m Temp Fall 1.0 °C 19:21 0.6 °C 1.6 °C, 2020 0.4 °C, 2012
Max 1hr Temp Fall 3.9 °C 19:48 1.9 °C 3.9 °C, 2022 1.3 °C, 2021
Max 1hr Hum Fall 13% 17:10 12% 22%, 2009 6%, 2017
Max 10m Wind Speed 9.4 mph 18:17 9.0 mph 16.7 mph, 2021 5.0 mph, 2012
Minimum Feels-like 12.8 °C 23:54 10.9 °C 14.2 °C, 2012 2.2 °C, 2013
Maximum Feels-like 20.5 °C 11:09 21.7 °C 31.2 °C, 2010 11.0 °C, 2013
Mean Feels-like 16.6 °C 16.5 °C 22.2 °C, 2012 6.5 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.4 °C (-1.2) 9.2 °C (+0.4) 18.5 °C (+9.9), 2010 4.9 °C (-3.7), 2014
Humidity Range 35% 36% 59%, 2010 19%, 2017
Pressure Range 8 hPa 5 hPa 11 hPa, 2016 1 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [7%]121 hrs (87%) [38%] 14.6 [101%], 2010 1 [7%], 2022
Wet Hours 1
[Mean rain rate: 0.5 mm/h]
26 hrs (87%) [4.7%] 5, 2021 0, 2009
Cloud Cover unknown
Events None
Comments eve rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 17.5 °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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Webcam Summary of Cloud Conditions

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