Daily Report for 15th May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.8 °C (+3.9) 04:46 10.1 °C (+2.0) 12.8 °C (+3.9), 2022 2.3 °C (-6.6), 2020
Maximum Temperature 17.9 °C (+0.3) 12:46 18.7 °C (+1.8) 22.6 °C (+5.0), 2018 11.5 °C (-6.1), 2012
Mean Temperature 15.2 °C (+2.1) 14.2 °C (+1.9) 16.3 °C, 2018 7.5 °C, 2012
Minimum Humidity 72% 12:32 57% 72%, 2022 38%, 2014
Maximum Humidity 89% 17:33 89% 97%, 2015 73%, 2018
Mean Humidity 82% 75% 83%, 2021 58%, 2010
Minimum Pressure 1013 hPa 20:31 1020 hPa 1033 hPa, 2014 987 hPa, 2013
Maximum Pressure 1021 hPa 00:14 1024 hPa 1036 hPa, 2014 1001 hPa, 2013
Mean Pressure 1017 hPa 1022 hPa 1035 hPa, 2014 994 hPa, 2013
Mean Wind Speed 2.8 mph (-1.9) 3.4 mph (-1.3) 8.5 mph, 2013 0.8 mph, 2021
Maximum Wind Speed 9.6 mph 11:05 11.5 mph 21.5 mph, 2013 6.7 mph, 2014
Maximum Gust 13.7 mph 07:38 17.7 mph 30.8 mph, 2013 8.7 mph, 2014
Mean Wind Direction SE
Rainfall 2.4 mm 11.8 mm (53%) 5.9 mm, 2012
Maximum Hourly Rain 1.2 mm 14:54 2.9 mm, 2021
Maximum 10-min Rain 0.5 mm 14:27 1.7 mm, 2021
Maximum Rain Rate 1.8 mm/h 14:27 16 mm/h, 2009
Minimum Dew Point 9.5 °C 04:02 7.4 °C 9.5 °C, 2022 0.2 °C, 2020
Maximum Dew Point 14.3 °C 14:27 11.9 °C 14.3 °C, 2022 6.2 °C, 2012
Mean Dew Point 12.1 °C 9.7 °C 12.1 °C, 2022 3.3 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.8 °C 04:47 10.2 °C 12.8 °C, 2022 2.3 °C, 2020
Day Maximum (09-21) 17.9 °C 12:47 18.7 °C 22.6 °C, 2018 11.5 °C, 2012
Max 10m Temp Rise 0.4 °C 10:43 0.6 °C 1.0 °C, 2020 0.4 °C, 2022
Max 1hr Temp Rise 1.7 °C 09:33 2.1 °C 4.7 °C, 2020 1.2 °C, 2009
Max 1hr Hum Rise 10% 14:42 10% 15%, 2012 5%, 2011
Max 10m Temp Fall 0.4 °C 14:18 0.5 °C 1.6 °C, 2012 0.4 °C, 2010
Max 1hr Temp Fall 1.2 °C 14:41 1.9 °C 3.3 °C, 2012 1.0 °C, 2015
Max 1hr Hum Fall 6% 09:19 11% 22%, 2020 6%, 2022
Max 10m Wind Speed 7.4 mph 11:21 8.6 mph 16.4 mph, 2013 4.8 mph, 2014
Minimum Feels-like 13.9 °C 04:36 10.0 °C 13.9 °C, 2022 1.1 °C, 2012
Maximum Feels-like 21.1 °C 13:04 20.5 °C 25.5 °C, 2018 11.5 °C, 2012
Mean Feels-like 17.6 °C 15.3 °C 17.6 °C, 2022 6.2 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.1 °C (-3.7) 8.7 °C (-0.2) 16.5 °C (+7.7), 2020 5.1 °C (-3.7), 2022
Humidity Range 17% 32% 49%, 2014 17%, 2022
Pressure Range 8 hPa 5 hPa 14 hPa, 2013 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]74 hrs (83%) [36%] 14 [99%], 2018 0 [0%], 2017
Wet Hours 4
[Mean rain rate: 0.6 mm/h]
18 hrs (90%) [4.9%] 4, 2009 0, 2010
Cloud Cover Overcast
Events None
Comments pm rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 16.5 °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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