Daily Report for 16th May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.6 °C (+2.6) 03:55 10.2 °C (+2.0) 15.7 °C (+6.7), 2017 2.9 °C (-6.1), 2013
Maximum Temperature 21.6 °C (+3.9) 14:18 18.9 °C (+1.9) 24.4 °C (+6.7), 2017 14.3 °C (-3.4), 2012
Mean Temperature 16.3 °C (+3.2) 14.3 °C (+1.9) 19.2 °C, 2017 9.9 °C, 2012
Minimum Humidity 64% 14:03 57% 67%, 2021 35%, 2019
Maximum Humidity 94% 06:40 90% 94%, 2009 79%, 2020
Mean Humidity 81% 76% 85%, 2021 60%, 2012
Minimum Pressure 1011 hPa 04:59 1019 hPa 1028 hPa, 2014 996 hPa, 2021
Maximum Pressure 1020 hPa 23:32 1024 hPa 1036 hPa, 2014 1001 hPa, 2013
Mean Pressure 1016 hPa 1021 hPa 1032 hPa, 2014 999 hPa, 2021
Mean Wind Speed 5.4 mph (+0.7) 3.5 mph (-1.2) 7.2 mph, 2017 0.8 mph, 2014
Maximum Wind Speed 16.9 mph 16:38 11.8 mph 17.2 mph, 2019 7.6 mph, 2014
Maximum Gust 24.0 mph 16:21 18.1 mph 24.2 mph, 2018 8.5 mph, 2014
Mean Wind Direction SW
Rainfall 0.2 mm 12.0 mm (51%) 8.8 mm, 2010
Maximum Hourly Rain 0.2 mm 6.3 mm, 2010
Maximum 10-min Rain 0.2 mm 2.7 mm, 2010
Maximum Rain Rate n/a 60, 2010
Minimum Dew Point 10.2 °C 03:34 7.6 °C 11.9 °C, 2017 -0.6 °C, 2012
Maximum Dew Point 15.7 °C 15:31 12.1 °C 15.9 °C, 2017 4.1 °C, 2012
Mean Dew Point 12.9 °C 9.9 °C 13.5 °C, 2017 1.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.6 °C 03:56 10.3 °C 15.7 °C, 2017 2.9 °C, 2013
Day Maximum (09-21) 21.6 °C 14:18 18.9 °C 24.4 °C, 2017 14.3 °C, 2012
Max 10m Temp Rise 0.7 °C 12:46 0.6 °C 1.1 °C, 2013 0.4 °C, 2011
Max 1hr Temp Rise 2.5 °C 13:24 2.1 °C 5.2 °C, 2013 1.5 °C, 2016
Max 1hr Hum Rise 9% 15:29 10% 28%, 2009 6%, 2011
Max 10m Temp Fall 0.5 °C 15:30 0.5 °C 0.8 °C, 2020 0.4 °C, 2017
Max 1hr Temp Fall 1.3 °C 15:33 1.8 °C 3.2 °C, 2020 1.2 °C, 2017
Max 1hr Hum Fall 11% 13:28 11% 23%, 2009 4%, 2010
Max 10m Wind Speed 13.8 mph 16:28 8.9 mph 13.8 mph, 2022 4.1 mph, 2014
Minimum Feels-like 13.0 °C 03:55 10.2 °C 18.4 °C, 2017 0.8 °C, 2012
Maximum Feels-like 25.6 °C 14:17 20.8 °C 27.5 °C, 2017 14.3 °C, 2012
Mean Feels-like 19.1 °C 15.6 °C 22.3 °C, 2017 9.2 °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 10.0 °C (+1.3) 8.8 °C (-0.1) 13.9 °C (+5.2), 2014 6.5 °C (-2.2), 2021
Humidity Range 30% 32% 56%, 2013 24%, 2018
Pressure Range 9 hPa 5 hPa 10 hPa, 2019 3 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [21%]77 hrs (81%) [35%] 12 [85%], 2019 0.4 [3%], 2018
Wet Hours 0.318 hrs (86%) [4.6%] 4, 2021 0, 2011
Cloud Cover am: Mostly Cloudy
pm: Partly Cloudy
Events None
Comments possible odd sh
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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Wind rose