Daily Report for 12th May 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.5 °C (+1.0) 04:07 9.9 °C (+2.0) 12.6 °C (+4.1), 2017 1.0 °C (-7.5), 2010
Maximum Temperature 13.4 °C (-3.9) 09:42 17.1 °C (+0.3) 18.8 °C (+1.5), 2017 11.4 °C (-5.9), 2010
Mean Temperature 10.9 °C (-1.4) 13.3 °C (+1.2) 17.8 °C, 2016 6.9 °C, 2010
Minimum Humidity 79% 09:45 67% 79%, 2023 34%, 2009
Maximum Humidity 94% 03:59 92% 94%, 2016 74%, 2009
Mean Humidity 89% 82% 89%, 2023 52%, 2015
Minimum Pressure 1020 hPa 00:03 1016 hPa 1033 hPa, 2012 993 hPa, 2017
Maximum Pressure 1027 hPa 23:46 1022 hPa 1040 hPa, 2019 1002 hPa, 2017
Mean Pressure 1024 hPa 1019 hPa 1036 hPa, 2019 996 hPa, 2017
Mean Wind Speed 7.1 mph (+2.4) 5.2 mph (+0.5) 7.1 mph, 2015 1.9 mph, 2020
Maximum Wind Speed 16.4 mph 15:02 13.3 mph 17.8 mph, 2015 7.6 mph, 2010
Maximum Gust 25.3 mph 10:20 19.3 mph 27.5 mph, 2015 10.9 mph, 2010
Mean Wind Direction NE
Rainfall 0.2 mm 22.6 mm (127%) 7.3 mm, 2018
Maximum Hourly Rain 0.2 mm 2.6 mm, 2018
Maximum 10-min Rain 0.2 mm 1.9 mm, 2014
Maximum Rain Rate n/a 54, 2014
Minimum Dew Point 8.1 °C 05:38 8.1 °C 10.4 °C, 2016 -2.2 °C, 2010
Maximum Dew Point 10.4 °C 09:27 12.0 °C 14.9 °C, 2016 2.8 °C, 2010
Mean Dew Point 9.1 °C 10.1 °C 12.6 °C, 2016 0.1 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.5 °C 04:07 10.1 °C 12.6 °C, 2017 1.0 °C, 2010
Day Maximum (09-21) 13.4 °C 09:43 17.1 °C 23.8 °C, 2016 11.4 °C, 2010
Max 10m Temp Rise 0.7 °C 09:25 0.6 °C 0.9 °C, 2019 0.4 °C, 2018
Max 1hr Temp Rise 1.7 °C 09:30 1.9 °C 4.5 °C, 2019 1.1 °C, 2018
Max 1hr Hum Rise 6% 11:21 9% 18%, 2013 6%, 2009
Max 10m Temp Fall 0.5 °C 10:48 0.6 °C 1.1 °C, 2014 0.4 °C, 2009
Max 1hr Temp Fall 1.3 °C 11:06 1.9 °C 3.1 °C, 2016 1.3 °C, 2018
Max 1hr Hum Fall 6% 09:45 8% 22%, 2019 6%, 2023
Max 10m Wind Speed 12.5 mph 12:33 10.1 mph 14.9 mph, 2015 5.4 mph, 2020
Minimum Feels-like 6.2 °C 23:40 9.6 °C 14.1 °C, 2016 -1.0 °C, 2010
Maximum Feels-like 14.9 °C 09:42 19.2 °C 26.5 °C, 2016 11.4 °C, 2010
Mean Feels-like 11.2 °C 14.5 °C 20.4 °C, 2016 6.0 °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 3.9 °C (-4.9) 7.2 °C (-1.7) 14.1 °C (+5.3), 2020 1.4 °C (-7.4), 2016
Humidity Range 15% 25% 58%, 2019 15%, 2023
Pressure Range 7 hPa 6 hPa 9 hPa, 2019 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [7%]50 hrs (71%) [30%] 12 [86%], 2016 0.2 [1%], 2018
Wet Hours 122 hrs (142%) [7.6%] 8, 2018 0, 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 15.5 °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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Wind rose