Daily Report for 17th May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.4 °C (+1.3) 05:32 10.2 °C (+2.0) 12.2 °C (+3.1), 2017 5.7 °C (-3.4), 2010
Maximum Temperature 25.9 °C (+8.0) 16:05 19.3 °C (+2.2) 25.9 °C (+8.0), 2022 11.6 °C (-6.3), 2013
Mean Temperature 19.4 °C (+4.7) 14.6 °C (+2.1) 19.4 °C, 2022 9.7 °C, 2013
Minimum Humidity 44% 16:23 57% 78%, 2017 37%, 2015
Maximum Humidity 95% 06:38 90% 95%, 2022 76%, 2015
Mean Humidity 68% 75% 87%, 2021 54%, 2015
Minimum Pressure 1015 hPa 18:55 1019 hPa 1027 hPa, 2018 998 hPa, 2021
Maximum Pressure 1020 hPa 09:31 1024 hPa 1029 hPa, 2018 1010 hPa, 2009
Mean Pressure 1018 hPa 1021 hPa 1028 hPa, 2018 1006 hPa, 2013
Mean Wind Speed 4.3 mph (-0.4) 3.6 mph (-1.1) 6.0 mph, 2011 1.2 mph, 2014
Maximum Wind Speed 13.5 mph 21:03 11.9 mph 14.1 mph, 2021 6.4 mph, 2014
Maximum Gust 26.2 mph 01:17 18.6 mph 26.2 mph, 2022 8.7 mph, 2014
Mean Wind Direction SSW
Rainfall 0.0 mm 12.0 mm (48%) 35.6 mm, 2017
Maximum Hourly Rain n/a 6.9, 2017
Maximum 10-min Rain n/a 2.4, 2021
Maximum Rain Rate n/a 32.8, 2009
Minimum Dew Point 8.9 °C 04:29 7.7 °C 10.1 °C, 2017 0.6 °C, 2012
Maximum Dew Point 15.6 °C 15:00 12.3 °C 16.2 °C, 2017 5.5 °C, 2012
Mean Dew Point 12.9 °C 10.0 °C 13.6 °C, 2017 3.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.4 °C 05:37 10.3 °C 16.0 °C, 2017 5.7 °C, 2010
Day Maximum (09-21) 25.9 °C 16:10 19.3 °C 25.9 °C, 2022 11.6 °C, 2013
Max 10m Temp Rise 0.9 °C 09:28 0.6 °C 0.9 °C, 2022 0.4 °C, 2019
Max 1hr Temp Rise 3.6 °C 10:11 2.2 °C 3.6 °C, 2022 1.2 °C, 2019
Max 1hr Hum Rise 14% 22:05 11% 22%, 2021 4%, 2017
Max 10m Temp Fall 0.8 °C 21:49 0.5 °C 2.5 °C, 2021 0.3 °C, 2019
Max 1hr Temp Fall 2.4 °C 22:07 1.9 °C 4.7 °C, 2021 0.9 °C, 2019
Max 1hr Hum Fall 14% 07:55 11% 24%, 2009 4%, 2017
Max 10m Wind Speed 11.3 mph 21:17 9.0 mph 11.3 mph, 2022 4.9 mph, 2014
Minimum Feels-like 11.2 °C 05:32 10.3 °C 13.5 °C, 2017 2.5 °C, 2018
Maximum Feels-like 30.1 °C 15:07 21.4 °C 30.1 °C, 2022 11.6 °C, 2013
Mean Feels-like 22.2 °C 16.0 °C 22.2 °C, 2022 9.4 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 15.5 °C (+6.8) 9.2 °C (+0.3) 15.5 °C (+6.8), 2022 5.5 °C (-3.2), 2013
Humidity Range 51% 33% 53%, 2020 11%, 2017
Pressure Range 5 hPa 5 hPa 14 hPa, 2012 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [70%]87 hrs (86%) [37%] 13 [91%], 2018 0 [0%], 2017
Wet Hours 018 hrs (81%) [4.4%] 14, 2017 0, 2010
Cloud Cover Mostly Sunny
Events None
Comments -
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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