Daily Report for 18th May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.7 °C (+3.5) 05:42 10.3 °C (+2.0) 12.7 °C (+3.5), 2022 3.9 °C (-5.3), 2018
Maximum Temperature 23.6 °C (+5.6) 14:37 19.6 °C (+2.4) 24.5 °C (+6.5), 2014 14.6 °C (-3.4), 2016
Mean Temperature 18.6 °C (+4.5) 14.9 °C (+2.2) 18.7 °C, 2014 11.7 °C, 2013
Minimum Humidity 34% 17:27 55% 71%, 2016 32%, 2020
Maximum Humidity 87% 05:51 90% 95%, 2019 75%, 2013
Mean Humidity 62% 74% 82%, 2019 56%, 2020
Minimum Pressure 1016 hPa 23:05 1019 hPa 1027 hPa, 2010 1002 hPa, 2012
Maximum Pressure 1023 hPa 10:27 1024 hPa 1030 hPa, 2010 1009 hPa, 2012
Mean Pressure 1020 hPa 1021 hPa 1028 hPa, 2010 1005 hPa, 2016
Mean Wind Speed 3.6 mph (-1.1) 3.6 mph (-1.1) 8.3 mph, 2015 0.4 mph, 2019
Maximum Wind Speed 11.7 mph 14:40 11.9 mph 21.0 mph, 2015 5.8 mph, 2019
Maximum Gust 17.1 mph 14:40 18.5 mph 39.8 mph, 2015 9.2 mph, 2019
Mean Wind Direction SW
Rainfall 0.5 mm 12.5 mm (47%) 15.0 mm, 2017
Maximum Hourly Rain 0.5 mm 23:48 3.2 mm, 2016
Maximum 10-min Rain 0.5 mm 23:48 2.0 mm, 2016
Maximum Rain Rate 1.8 mm/h 23:48 30 mm/h, 2016
Minimum Dew Point 6.0 °C 19:14 7.6 °C 8.3 °C, 2011 0.2 °C, 2015
Maximum Dew Point 14.6 °C 23:56 12.4 °C 14.6 °C, 2022 6.4 °C, 2013
Mean Dew Point 10.5 °C 10.1 °C 11.4 °C, 2011 4.9 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.7 °C 05:43 10.4 °C 13.1 °C, 2011 3.9 °C, 2018
Day Maximum (09-21) 23.6 °C 14:38 19.6 °C 24.5 °C, 2014 14.6 °C, 2016
Max 10m Temp Rise 0.6 °C 10:57 0.6 °C 0.8 °C, 2012 0.4 °C, 2011
Max 1hr Temp Rise 2.4 °C 11:07 2.2 °C 4.0 °C, 2014 1.2 °C, 2011
Max 1hr Hum Rise 18% 23:55 11% 23%, 2021 5%, 2013
Max 10m Temp Fall 0.3 °C 00:27 0.5 °C 1.5 °C, 2021 0.3 °C, 2013
Max 1hr Temp Fall 1.5 °C 01:16 1.8 °C 3.5 °C, 2021 0.9 °C, 2012
Max 1hr Hum Fall 10% 11:08 11% 22%, 2015 7%, 2016
Max 10m Wind Speed 8.3 mph 14:26 9.0 mph 18.0 mph, 2015 3.4 mph, 2019
Minimum Feels-like 14.2 °C 05:33 10.5 °C 14.2 °C, 2022 2.6 °C, 2018
Maximum Feels-like 25.5 °C 14:37 21.6 °C 25.5 °C, 2022 15.2 °C, 2013
Mean Feels-like 20.1 °C 16.2 °C 20.1 °C, 2022 11.4 °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 10.9 °C (+2.2) 9.3 °C (+0.4) 14.2 °C (+5.5), 2018 3.4 °C (-5.3), 2016
Humidity Range 53% 35% 58%, 2014 15%, 2016
Pressure Range 7 hPa 5 hPa 15 hPa, 2015 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [56%]95 hrs (88%) [38%] 13.5 [95%], 2014 0.1 [1%], 2016
Wet Hours 1
[Mean rain rate: 0.5 mm/h]
19 hrs (81%) [4.4%] 9, 2017 0, 2010
Cloud Cover Hazy or Sunny
Events None
Comments late rn
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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