Daily Report for 21st May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.4 °C (+0.8) 05:31 10.6 °C (+2.1) 13.5 °C (+3.9), 2016 5.5 °C (-4.1), 2015
Maximum Temperature 20.3 °C (+2.0) 16:47 19.6 °C (+2.3) 27.4 °C (+9.1), 2020 12.7 °C (-5.6), 2021
Mean Temperature 15.3 °C (+1.4) 15.0 °C (+2.2) 21.4 °C, 2020 11.3 °C, 2021
Minimum Humidity 49% 15:53 55% 71%, 2012 28%, 2020
Maximum Humidity 87% 05:45 90% 93%, 2012 81%, 2015
Mean Humidity 69% 74% 83%, 2012 55%, 2011
Minimum Pressure 1020 hPa 20:54 1019 hPa 1029 hPa, 2010 996 hPa, 2021
Maximum Pressure 1023 hPa 09:49 1024 hPa 1032 hPa, 2010 1002 hPa, 2021
Mean Pressure 1022 hPa 1021 hPa 1030 hPa, 2010 998 hPa, 2021
Mean Wind Speed 3.8 mph (-0.9) 3.6 mph (-1.1) 13.9 mph, 2021 2.2 mph, 2018
Maximum Wind Speed 10.7 mph 15:22 11.9 mph 23.5 mph, 2021 8.4 mph, 2010
Maximum Gust 18.2 mph 02:04 18.5 mph 42.2 mph, 2021 12.0 mph, 2010
Mean Wind Direction W
Rainfall 0.0 mm 18.8 mm (60%) 2.4 mm, 2021
Maximum Hourly Rain n/a 0.7, 2021
Maximum 10-min Rain n/a 0.5, 2021
Maximum Rain Rate n/a 2.4, 2021
Minimum Dew Point 8.2 °C 05:23 7.6 °C 9.5 °C, 2010 1.2 °C, 2015
Maximum Dew Point 11.0 °C 09:07 12.5 °C 15.5 °C, 2020 7.6 °C, 2015
Mean Dew Point 9.2 °C 10.1 °C 12.2 °C, 2010 3.8 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.4 °C 05:32 10.7 °C 13.5 °C, 2016 5.5 °C, 2015
Day Maximum (09-21) 20.3 °C 16:47 19.6 °C 27.4 °C, 2020 12.7 °C, 2021
Max 10m Temp Rise 0.6 °C 08:54 0.6 °C 1.7 °C, 2010 0.4 °C, 2012
Max 1hr Temp Rise 2.5 °C 09:15 2.3 °C 5.7 °C, 2011 1.0 °C, 2016
Max 1hr Hum Rise 9% 21:33 11% 14%, 2018 4%, 2012
Max 10m Temp Fall 0.6 °C 14:24 0.5 °C 1.0 °C, 2010 0.2 °C, 2012
Max 1hr Temp Fall 2.1 °C 22:31 1.8 °C 2.4 °C, 2020 0.7 °C, 2012
Max 1hr Hum Fall 10% 09:21 11% 25%, 2010 5%, 2012
Max 10m Wind Speed 7.7 mph 13:14 9.0 mph 18.3 mph, 2021 6.6 mph, 2018
Minimum Feels-like 10.9 °C 05:17 10.9 °C 15.1 °C, 2020 3.0 °C, 2015
Maximum Feels-like 21.5 °C 16:46 21.6 °C 29.8 °C, 2020 13.1 °C, 2021
Mean Feels-like 16.3 °C 16.4 °C 23.3 °C, 2020 11.6 °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 9.9 °C (+1.2) 9.1 °C (+0.2) 14.6 °C (+5.9), 2015 2.8 °C (-5.9), 2021
Humidity Range 38% 35% 58%, 2020 17%, 2013
Pressure Range 3 hPa 5 hPa 10 hPa, 2014 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [42%]111 hrs (88%) [38%] 13.5 [94%], 2011 0 [0%], 2021
Wet Hours 025 hrs (92%) [4.9%] 5, 2021 0, 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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