Daily Report for 8th July 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 18.6 °C (+4.8) 05:39 13.2 °C (-0.4) 18.6 °C (+4.8), 2023 10.8 °C (-3.0), 2014
Maximum Temperature 25.6 °C (+2.8) 11:42 22.6 °C (+0.0) 30.8 °C (+8.0), 2018 18.0 °C (-4.8), 2009
Mean Temperature 21.9 °C (+3.8) 18.0 °C (-0.2) 23.8 °C, 2018 14.8 °C, 2009
Minimum Humidity 60% 11:44 52% 78%, 2020 32%, 2017
Maximum Humidity 89% 14:37 89% 97%, 2012 75%, 2017
Mean Humidity 76% 70% 90%, 2012 54%, 2017
Minimum Pressure 1014 hPa 03:55 1011 hPa 1031 hPa, 2022 1002 hPa, 2012
Maximum Pressure 1019 hPa 23:14 1015 hPa 1034 hPa, 2022 1007 hPa, 2011
Mean Pressure 1016 hPa 1013 hPa 1033 hPa, 2022 1005 hPa, 2011
Mean Wind Speed 2.9 mph (-1.4) 5.7 mph (+1.4) 8.9 mph, 2016 1.9 mph, 2014
Maximum Wind Speed 11.1 mph 08:32 14.8 mph 22.6 mph, 2016 8.4 mph, 2021
Maximum Gust 17.3 mph 08:14 23.5 mph 38.7 mph, 2016 11.4 mph, 2021
Mean Wind Direction S
Rainfall 7.0 mm 19.0 mm (160%) 19.8 mm, 2012
Maximum Hourly Rain 5.0 mm 12:18 7.1 mm, 2012
Maximum 10-min Rain 4.4 mm 12:13 4.4 mm, 2023
Maximum Rain Rate 42 mm/h 12:09 42 mm/h, 2023
Minimum Dew Point 14.7 °C 00:14 9.7 °C 14.7 °C, 2023 4.6 °C, 2015
Maximum Dew Point 19.8 °C 12:27 14.6 °C 19.8 °C, 2023 12.5 °C, 2015
Mean Dew Point 17.5 °C 12.2 °C 17.5 °C, 2023 9.4 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 18.6 °C 05:38 13.4 °C 18.6 °C, 2023 10.8 °C, 2014
Day Maximum (09-21) 25.6 °C 11:42 22.6 °C 30.8 °C, 2018 18.0 °C, 2009
Max 10m Temp Rise 0.7 °C 07:50 0.7 °C 1.3 °C, 2009 0.5 °C, 2011
Max 1hr Temp Rise 2.7 °C 07:58 2.4 °C 3.1 °C, 2014 1.7 °C, 2015
Max 1hr Hum Rise 26% 12:53 12% 26%, 2023 4%, 2020
Max 10m Temp Fall 1.0 °C 12:15 0.7 °C 1.0 °C, 2023 0.4 °C, 2016
Max 1hr Temp Fall 3.5 °C 12:52 2.1 °C 3.5 °C, 2023 1.2 °C, 2020
Max 1hr Hum Fall 11% 15:46 12% 18%, 2014 8%, 2022
Max 10m Wind Speed 8.6 mph 08:16 11.2 mph 18.4 mph, 2016 5.9 mph, 2021
Minimum Feels-like 22.5 °C 05:23 14.7 °C 22.5 °C, 2023 11.8 °C, 2014
Maximum Feels-like 32.0 °C 17:56 25.4 °C 34.2 °C, 2018 20.8 °C, 2011
Mean Feels-like 27.6 °C 20.5 °C 27.6 °C, 2023 16.8 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.0 °C (-2.1) 9.5 °C (+0.4) 15.3 °C (+6.2), 2018 4.5 °C (-4.6), 2011
Humidity Range 29% 38% 50%, 2018 17%, 2020
Pressure Range 5 hPa 5 hPa 12 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]47 hrs (91%) [39%] 14.4 [96%], 2013 0 [0%], 2020
Wet Hours 4
[Mean rain rate: 1.8 mm/h]
17 hrs (194%) [8.9%] 12, 2020 0, 2010
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 20.0 °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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Webcam Summary of Cloud Conditions

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