Daily Report for 27th May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.6 °C (+1.2) 23:57 10.6 °C (+1.7) 15.1 °C (+4.7), 2017 7.5 °C (-2.9), 2015
Maximum Temperature 20.0 °C (+1.1) 17:07 19.7 °C (+2.0) 27.1 °C (+8.2), 2018 13.2 °C (-5.8), 2014
Mean Temperature 16.0 °C (+1.1) 15.0 °C (+1.9) 20.7 °C, 2018 11.5 °C, 2009
Minimum Humidity 44% 18:04 54% 89%, 2014 29%, 2012
Maximum Humidity 90% 05:07 90% 97%, 2014 65%, 2013
Mean Humidity 66% 74% 94%, 2014 47%, 2013
Minimum Pressure 1023 hPa 04:34 1017 hPa 1035 hPa, 2020 1004 hPa, 2013
Maximum Pressure 1028 hPa 23:17 1022 hPa 1037 hPa, 2020 1011 hPa, 2010
Mean Pressure 1025 hPa 1020 hPa 1036 hPa, 2020 1009 hPa, 2013
Mean Wind Speed 5.9 mph (+1.2) 3.9 mph (-0.8) 6.7 mph, 2013 1.6 mph, 2021
Maximum Wind Speed 13.1 mph 16:40 12.5 mph 19.2 mph, 2013 7.9 mph, 2021
Maximum Gust 28.5 mph 01:12 19.8 mph 28.5 mph, 2022 11.4 mph, 2021
Mean Wind Direction NW
Rainfall 0.0 mm 23.6 mm (59%) 6.5 mm, 2014
Maximum Hourly Rain n/a 2.4, 2018
Maximum 10-min Rain n/a 1.8, 2018
Maximum Rain Rate n/a 40, 2018
Minimum Dew Point 5.7 °C 23:41 7.6 °C 12.8 °C, 2018 0.4 °C, 2013
Maximum Dew Point 12.5 °C 00:28 12.5 °C 19.4 °C, 2018 5.3 °C, 2013
Mean Dew Point 9.2 °C 10.1 °C 16.1 °C, 2018 2.3 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.2 °C * 05:36 10.8 °C 15.1 °C, 2017 7.5 °C, 2015
Day Maximum (09-21) 20.0 °C 17:09 19.7 °C 27.1 °C, 2018 13.2 °C, 2014
Max 10m Temp Rise 0.6 °C 10:45 0.6 °C 0.9 °C, 2019 0.2 °C, 2014
Max 1hr Temp Rise 2.0 °C 11:30 2.3 °C 3.3 °C, 2018 0.6 °C, 2014
Max 1hr Hum Rise 8% 21:18 11% 15%, 2018 2%, 2014
Max 10m Temp Fall 0.5 °C 20:18 0.6 °C 1.1 °C, 2017 0.2 °C, 2009
Max 1hr Temp Fall 2.4 °C 21:03 1.9 °C 2.7 °C, 2017 0.8 °C, 2009
Max 1hr Hum Fall 10% 08:34 12% 15%, 2010 4%, 2009
Max 10m Wind Speed 9.8 mph 14:58 9.4 mph 13.5 mph, 2017 5.2 mph, 2021
Minimum Feels-like 11.6 °C 23:56 10.8 °C 16.9 °C, 2017 5.3 °C, 2013
Maximum Feels-like 20.8 °C 16:20 21.6 °C 33.7 °C, 2018 15.4 °C, 2014
Mean Feels-like 17.0 °C 16.4 °C 25.4 °C, 2018 12.3 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.4 °C (-0.1) 9.1 °C (+0.3) 13.2 °C (+4.7), 2012 3.5 °C (-5.0), 2014
Humidity Range 46% 35% 46%, 2010 8%, 2014
Pressure Range 4 hPa 6 hPa 12 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 12 [82%]143 hrs (87%) [38%] 14.7 [101%], 2012 0 [0%], 2009
Wet Hours 032 hrs (93%) [5%] 10, 2014 0, 2011
Cloud Cover unknown
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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