Daily Report for 9th May 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.6 °C (+3.5) 22:22 9.9 °C (+2.2) 14.2 °C (+6.1), 2016 5.9 °C (-2.2), 2022
Maximum Temperature 19.4 °C (+2.4) 16:11 17.3 °C (+0.7) 24.8 °C (+7.8), 2016 11.5 °C (-5.5), 2010
Mean Temperature 14.6 °C (+3.0) 13.5 °C (+1.5) 18.5 °C, 2016 8.4 °C, 2010
Minimum Humidity 68% 16:35 66% 72%, 2012 33%, 2016
Maximum Humidity 95% 02:40 91% 96%, 2019 74%, 2017
Mean Humidity 86% 81% 90%, 2012 56%, 2016
Minimum Pressure 1010 hPa 17:36 1016 hPa 1019 hPa, 2011 993 hPa, 2019
Maximum Pressure 1016 hPa 00:04 1022 hPa 1030 hPa, 2022 1002 hPa, 2021
Mean Pressure 1012 hPa 1019 hPa 1024 hPa, 2022 998 hPa, 2019
Mean Wind Speed 4.3 mph (-0.4) 5.3 mph (+0.6) 10.0 mph, 2013 2.4 mph, 2019
Maximum Wind Speed 12.3 mph 16:57 13.0 mph 24.6 mph, 2013 8.3 mph, 2017
Maximum Gust 18.4 mph 17:16 19.3 mph 38.4 mph, 2013 12.6 mph, 2017
Mean Wind Direction WNW
Rainfall 10.4 mm 17.8 mm (133%) 10.4 mm, 2023
Maximum Hourly Rain 4.3 mm 20:24 4.3 mm, 2023
Maximum 10-min Rain 1.5 mm 19:52 1.5 mm, 2023
Maximum Rain Rate 14 mm/h 19:44 14 mm/h, 2023
Minimum Dew Point 10.3 °C 22:14 7.9 °C 10.3 °C, 2023 1.1 °C, 2017
Maximum Dew Point 13.8 °C 15:42 12.0 °C 14.1 °C, 2021 4.3 °C, 2017
Mean Dew Point 12.2 °C 10.1 °C 12.2 °C, 2023 2.6 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 12.6 °C * 05:43 10.2 °C 14.2 °C, 2016 5.9 °C, 2022
Day Maximum (09-21) 19.4 °C 16:11 17.3 °C 24.8 °C, 2016 11.5 °C, 2010
Max 10m Temp Rise 0.6 °C 13:41 0.6 °C 1.0 °C, 2020 0.5 °C, 2010
Max 1hr Temp Rise 1.5 °C 14:20 1.9 °C 4.8 °C, 2020 1.5 °C, 2023
Max 1hr Hum Rise 9% 17:40 8% 28%, 2013 5%, 2015
Max 10m Temp Fall 1.2 °C 18:37 0.5 °C 1.2 °C, 2013 0.3 °C, 2010
Max 1hr Temp Fall 3.3 °C 19:05 1.8 °C 3.3 °C, 2023 1.1 °C, 2012
Max 1hr Hum Fall 8% 14:32 8% 24%, 2013 6%, 2012
Max 10m Wind Speed 10.9 mph 17:24 10.1 mph 18.7 mph, 2013 6.1 mph, 2019
Minimum Feels-like 13.0 °C 22:18 9.7 °C 14.2 °C, 2016 3.1 °C, 2017
Maximum Feels-like 22.5 °C 16:11 19.4 °C 25.7 °C, 2016 11.5 °C, 2010
Mean Feels-like 17.0 °C 14.7 °C 19.5 °C, 2016 7.1 °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 7.8 °C (-1.1) 7.4 °C (-1.6) 15.9 °C (+7.0), 2022 4.5 °C (-4.4), 2012
Humidity Range 27% 25% 56%, 2020 23%, 2012
Pressure Range 6 hPa 6 hPa 14 hPa, 2017 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [7%]36 hrs (68%) [29%] 12.5 [90%], 2011 0 [0%], 2012
Wet Hours 7
[Mean rain rate: 1.5 mm/h]
17 hrs (146%) [7.9%] 7, 2023 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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Webcam Summary of Cloud Conditions

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