Daily Report for 30th May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.2 °C (-5.6) 05:23 10.2 °C (+1.2) 15.0 °C (+4.2), 2017 5.2 °C (-5.6), 2022
Maximum Temperature 15.2 °C (-4.1) 12:10 19.3 °C (+1.5) 25.4 °C (+6.1), 2012 15.1 °C (-4.2), 2013
Mean Temperature 10.7 °C (-4.8) 14.7 °C (+1.4) 19.2 °C, 2012 10.7 °C, 2022
Minimum Humidity 61% 12:18 54% 80%, 2018 30%, 2009
Maximum Humidity 94% 06:20 89% 97%, 2013 81%, 2015
Mean Humidity 79% 74% 90%, 2018 55%, 2015
Minimum Pressure 1013 hPa 17:52 1017 hPa 1026 hPa, 2021 1006 hPa, 2010
Maximum Pressure 1017 hPa 00:03 1023 hPa 1031 hPa, 2021 1013 hPa, 2011
Mean Pressure 1015 hPa 1020 hPa 1029 hPa, 2021 1010 hPa, 2011
Mean Wind Speed 2.3 mph (-2.4) 3.8 mph (-0.9) 8.1 mph, 2019 1.6 mph, 2018
Maximum Wind Speed 11.4 mph 12:22 12.4 mph 19.1 mph, 2019 7.0 mph, 2018
Maximum Gust 19.4 mph 01:17 19.8 mph 27.6 mph, 2019 12.7 mph, 2018
Mean Wind Direction SW
Rainfall 0.7 mm 24.3 mm (55%) 5.1 mm, 2013
Maximum Hourly Rain 0.5 mm 18:46 2.0 mm, 2013
Maximum 10-min Rain 0.5 mm 18:46 0.6 mm, 2013
Maximum Rain Rate 2.4 mm/h 18:46 2.8 mm/h, 2013
Minimum Dew Point 3.7 °C 04:46 7.3 °C 11.7 °C, 2018 1.2 °C, 2015
Maximum Dew Point 9.1 °C 15:03 12.1 °C 17.0 °C, 2018 6.3 °C, 2015
Mean Dew Point 7.0 °C 9.8 °C 13.9 °C, 2018 3.3 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.2 °C 05:26 10.4 °C 15.0 °C, 2017 5.2 °C, 2022
Day Maximum (09-21) 15.2 °C 14:35 19.3 °C 25.4 °C, 2012 15.1 °C, 2013
Max 10m Temp Rise 0.8 °C 06:41 0.6 °C 0.9 °C, 2009 0.4 °C, 2014
Max 1hr Temp Rise 3.5 °C 06:52 2.4 °C 3.5 °C, 2022 1.2 °C, 2016
Max 1hr Hum Rise 20% 13:41 11% 22%, 2012 4%, 2013
Max 10m Temp Fall 0.9 °C 13:11 0.6 °C 1.0 °C, 2012 0.2 °C, 2016
Max 1hr Temp Fall 3.1 °C 13:38 1.9 °C 3.2 °C, 2012 0.9 °C, 2016
Max 1hr Hum Fall 15% 14:52 12% 20%, 2012 7%, 2018
Max 10m Wind Speed 8.8 mph 18:30 9.4 mph 12.6 mph, 2019 4.9 mph, 2018
Minimum Feels-like 2.2 °C 01:17 10.1 °C 17.2 °C, 2017 2.2 °C, 2022
Maximum Feels-like 15.8 °C 17:01 21.1 °C 27.5 °C, 2019 15.8 °C, 2022
Mean Feels-like 10.9 °C 16.0 °C 22.1 °C, 2019 10.9 °C, 2022
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.0 °C (+1.5) 9.1 °C (+0.4) 14.3 °C (+5.8), 2020 4.4 °C (-4.1), 2013
Humidity Range 33% 35% 60%, 2009 15%, 2018
Pressure Range 4 hPa 5 hPa 10 hPa, 2010 1 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [7%]156 hrs (85%) [37%] 14.8 [100%], 2020 0 [0%], 2014
Wet Hours 1
[Mean rain rate: 0.7 mm/h]
33 hrs (86%) [4.6%] 5, 2013 0, 2009
Cloud Cover unknown
Events None
Comments shs
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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