Daily Report for 22nd May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.3 °C (-0.5) 05:20 10.5 °C (+2.0) 14.2 °C (+4.4), 2020 8.2 °C (-1.6), 2009
Maximum Temperature 23.7 °C (+5.3) 14:06 19.8 °C (+2.5) 25.2 °C (+6.8), 2017 14.2 °C (-4.2), 2013
Mean Temperature 17.4 °C (+2.4) 15.1 °C (+2.2) 19.1 °C, 2020 10.7 °C, 2021
Minimum Humidity 37% 18:30 54% 62%, 2021 35%, 2011
Maximum Humidity 95% 06:51 90% 95%, 2022 75%, 2020
Mean Humidity 64% 74% 82%, 2021 54%, 2019
Minimum Pressure 1009 hPa 23:42 1018 hPa 1027 hPa, 2010 997 hPa, 2021
Maximum Pressure 1020 hPa 00:11 1023 hPa 1031 hPa, 2010 1003 hPa, 2014
Mean Pressure 1015 hPa 1021 hPa 1029 hPa, 2010 1001 hPa, 2014
Mean Wind Speed 2.9 mph (-1.8) 3.6 mph (-1.1) 9.1 mph, 2011 2.3 mph, 2016
Maximum Wind Speed 10.0 mph 16:03 11.8 mph 21.0 mph, 2011 9.4 mph, 2010
Maximum Gust 18.2 mph 01:18 18.5 mph 33.8 mph, 2011 13.6 mph, 2010
Mean Wind Direction SW
Rainfall 0.0 mm 18.8 mm (58%) 7.8 mm, 2014
Maximum Hourly Rain n/a 3.2, 2014
Maximum 10-min Rain n/a 1.7, 2014
Maximum Rain Rate n/a 30, 2014
Minimum Dew Point 6.5 °C 18:31 7.5 °C 9.6 °C, 2012 0.0 °C, 2013
Maximum Dew Point 12.2 °C 16:56 12.4 °C 15.5 °C, 2012 8.2 °C, 2009
Mean Dew Point 9.8 °C 10.1 °C 12.6 °C, 2012 5.4 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.3 °C 05:21 10.6 °C 17.2 °C, 2020 8.2 °C, 2009
Day Maximum (09-21) 23.7 °C 14:25 19.8 °C 25.2 °C, 2017 14.2 °C, 2013
Max 10m Temp Rise 0.8 °C 07:54 0.6 °C 1.0 °C, 2012 0.5 °C, 2013
Max 1hr Temp Rise 3.8 °C 08:17 2.3 °C 3.9 °C, 2012 1.1 °C, 2013
Max 1hr Hum Rise 9% 20:14 11% 21%, 2014 4%, 2013
Max 10m Temp Fall 0.5 °C 01:09 0.5 °C 2.3 °C, 2014 0.3 °C, 2015
Max 1hr Temp Fall 2.1 °C 01:47 1.8 °C 4.4 °C, 2014 1.2 °C, 2015
Max 1hr Hum Fall 24% 08:13 12% 24%, 2022 7%, 2021
Max 10m Wind Speed 8.3 mph 16:03 8.9 mph 14.7 mph, 2020 6.2 mph, 2012
Minimum Feels-like 9.7 °C 04:56 10.8 °C 15.2 °C, 2020 5.3 °C, 2013
Maximum Feels-like 25.8 °C 14:03 21.8 °C 28.7 °C, 2012 14.2 °C, 2013
Mean Feels-like 18.6 °C 16.5 °C 20.2 °C, 2020 9.8 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 14.4 °C (+5.8) 9.3 °C (+0.5) 14.4 °C (+5.8), 2017 5.8 °C (-2.8), 2014
Humidity Range 58% 36% 58%, 2022 27%, 2015
Pressure Range 12 hPa 5 hPa 13 hPa, 2021 3 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [62%]120 hrs (91%) [39%] 14.5 [100%], 2010 1.7 [12%], 2013
Wet Hours 025 hrs (87%) [4.7%] 7, 2021 0, 2009
Cloud Cover unknown
Events None
Comments -
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose