Daily Report for 31st May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.2 °C (-1.6) 04:04 10.2 °C (+1.1) 14.8 °C (+4.0), 2018 6.8 °C (-4.0), 2014
Maximum Temperature 15.4 °C (-3.9) 11:42 19.2 °C (+1.4) 25.3 °C (+6.0), 2009 13.2 °C (-6.1), 2016
Mean Temperature 11.9 °C (-2.7) 14.6 °C (+1.2) 18.1 °C, 2017 11.9 °C, 2022
Minimum Humidity 63% 11:49 55% 73%, 2018 35%, 2011
Maximum Humidity 93% 05:42 89% 97%, 2018 78%, 2020
Mean Humidity 82% 74% 88%, 2018 55%, 2020
Minimum Pressure 1013 hPa 14:23 1017 hPa 1024 hPa, 2009 1004 hPa, 2015
Maximum Pressure 1016 hPa 23:56 1022 hPa 1027 hPa, 2011 1012 hPa, 2015
Mean Pressure 1014 hPa 1020 hPa 1025 hPa, 2014 1007 hPa, 2015
Mean Wind Speed 2.7 mph (-2.0) 3.8 mph (-0.9) 7.2 mph, 2016 1.0 mph, 2014
Maximum Wind Speed 10.4 mph 11:35 12.3 mph 17.0 mph, 2015 6.4 mph, 2014
Maximum Gust 17.1 mph 01:22 19.7 mph 26.5 mph, 2020 8.7 mph, 2014
Mean Wind Direction W
Rainfall 4.1 mm 28.4 mm (62%) 12.4 mm, 2016
Maximum Hourly Rain 2.2 mm 01:44 5.8 mm, 2016
Maximum 10-min Rain 1.0 mm 01:24 1.3 mm, 2016
Maximum Rain Rate 7 mm/h 14:52 24 mm/h, 2016
Minimum Dew Point 7.8 °C 04:00 7.3 °C 14.2 °C, 2018 0.2 °C, 2015
Maximum Dew Point 10.4 °C 12:41 12.1 °C 18.2 °C, 2018 8.8 °C, 2011
Mean Dew Point 8.9 °C 9.7 °C 15.9 °C, 2018 5.1 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.2 °C 04:34 10.3 °C 14.8 °C, 2018 6.8 °C, 2014
Day Maximum (09-21) 15.4 °C 11:43 19.2 °C 25.3 °C, 2009 12.9 °C, 2016
Max 10m Temp Rise 0.7 °C 11:11 0.6 °C 1.0 °C, 2021 0.3 °C, 2016
Max 1hr Temp Rise 1.8 °C 11:33 2.4 °C 4.4 °C, 2021 0.8 °C, 2016
Max 1hr Hum Rise 17% 15:21 11% 17%, 2022 4%, 2018
Max 10m Temp Fall 1.6 °C 14:57 0.6 °C 1.6 °C, 2022 0.2 °C, 2016
Max 1hr Temp Fall 3.1 °C 15:25 2.0 °C 3.1 °C, 2022 0.6 °C, 2016
Max 1hr Hum Fall 11% 08:33 12% 18%, 2014 2%, 2016
Max 10m Wind Speed 8.5 mph 11:38 9.3 mph 12.8 mph, 2015 3.9 mph, 2014
Minimum Feels-like 7.5 °C 03:56 10.0 °C 18.3 °C, 2018 5.6 °C, 2011
Maximum Feels-like 16.5 °C 14:26 21.0 °C 28.6 °C, 2018 14.7 °C, 2016
Mean Feels-like 12.5 °C 15.8 °C 22.7 °C, 2018 12.4 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.2 °C (-2.3) 9.0 °C (+0.3) 15.3 °C (+6.8), 2021 2.3 °C (-6.2), 2016
Humidity Range 30% 35% 52%, 2011 17%, 2019
Pressure Range 4 hPa 5 hPa 15 hPa, 2011 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]159 hrs (84%) [36%] 14.8 [100%], 2020 0 [0%], 2016
Wet Hours 3
[Mean rain rate: 1.4 mm/h]
36 hrs (91%) [4.9%] 7, 2015 0, 2009
Cloud Cover unknown
Events Light Thunderstorm
Comments shs and storms
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 17.0 °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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