Daily Report for 14th May 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.9 °C (-0.8) 07:21 9.7 °C (+1.7) 11.8 °C (+3.1), 2009 3.0 °C (-5.7), 2020
Maximum Temperature 20.9 °C (+3.4) 17:53 17.1 °C (+0.1) 23.4 °C (+5.9), 2022 10.7 °C (-6.8), 2015
Mean Temperature 13.9 °C (+1.3) 13.2 °C (+0.9) 16.3 °C, 2022 8.5 °C, 2020
Minimum Humidity 51% 18:05 67% 72%, 2015 35%, 2018
Maximum Humidity 94% 06:30 92% 97%, 2015 75%, 2011
Mean Humidity 77% 82% 86%, 2015 55%, 2011
Minimum Pressure 1018 hPa 23:55 1017 hPa 1031 hPa, 2019 990 hPa, 2013
Maximum Pressure 1026 hPa 00:03 1023 hPa 1039 hPa, 2019 1010 hPa, 2013
Mean Pressure 1022 hPa 1020 hPa 1035 hPa, 2019 1003 hPa, 2013
Mean Wind Speed 2.5 mph (-2.2) 4.9 mph (+0.2) 6.4 mph, 2012 1.5 mph, 2022
Maximum Wind Speed 8.9 mph 19:02 12.8 mph 17.3 mph, 2013 7.1 mph, 2022
Maximum Gust 11.5 mph 14:05 18.5 mph 26.6 mph, 2013 10.3 mph, 2022
Mean Wind Direction N
Rainfall 0.0 mm 22.6 mm (109%) 14.4 mm, 2015
Maximum Hourly Rain n/a 3, 2015
Maximum 10-min Rain n/a 1, 2015
Maximum Rain Rate n/a 20, 2017
Minimum Dew Point 6.8 °C 07:04 8.0 °C 9.7 °C, 2009 0.1 °C, 2020
Maximum Dew Point 13.4 °C 16:39 11.9 °C 13.4 °C, 2023 3.6 °C, 2020
Mean Dew Point 9.6 °C 10.0 °C 11.4 °C, 2009 1.9 °C, 2020
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.9 °C 07:01 9.9 °C 12.2 °C, 2017 3.0 °C, 2020
Day Maximum (09-21) 20.9 °C 17:54 17.1 °C 23.4 °C, 2022 10.7 °C, 2015
Max 10m Temp Rise 0.7 °C 11:05 0.6 °C 0.8 °C, 2020 0.3 °C, 2015
Max 1hr Temp Rise 3.2 °C 11:40 2.0 °C 3.2 °C, 2023 0.9 °C, 2015
Max 1hr Hum Rise 11% 19:00 9% 21%, 2017 4%, 2009
Max 10m Temp Fall 0.4 °C 18:22 0.5 °C 1.3 °C, 2017 0.3 °C, 2009
Max 1hr Temp Fall 1.3 °C 19:13 1.7 °C 3.7 °C, 2017 0.7 °C, 2021
Max 1hr Hum Fall 11% 12:00 8% 24%, 2018 7%, 2015
Max 10m Wind Speed 5.4 mph 17:52 9.6 mph 12.2 mph, 2013 4.5 mph, 2022
Minimum Feels-like 6.0 °C 06:13 9.1 °C 10.4 °C, 2017 -1.3 °C, 2020
Maximum Feels-like 23.7 °C 17:24 19.1 °C 25.4 °C, 2022 10.7 °C, 2015
Mean Feels-like 14.8 °C 14.2 °C 17.6 °C, 2022 7.2 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.0 °C (+4.2) 7.3 °C (-1.6) 14.2 °C (+5.4), 2022 2.7 °C (-6.1), 2015
Humidity Range 43% 25% 58%, 2014 25%, 2015
Pressure Range 8 hPa 6 hPa 20 hPa, 2013 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [50%]57 hrs (69%) [30%] 14.1 [100%], 2019 0 [0%], 2015
Wet Hours 022 hrs (122%) [6.5%] 14, 2015 0, 2010
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 16.3 °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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