Daily Report for 3rd September 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.7 °C (-0.0) 06:36 14.8 °C (+2.1) 15.6 °C (+2.9), 2020 9.4 °C (-3.3), 2015
Maximum Temperature 25.7 °C (+4.6) 16:20 23.6 °C (+2.5) 25.7 °C (+4.6), 2023 15.9 °C (-5.2), 2015
Mean Temperature 19.3 °C (+2.3) 18.7 °C (+2.3) 19.4 °C, 2022 12.5 °C, 2015
Minimum Humidity 61% 14:37 69% 81%, 2020 38%, 2012
Maximum Humidity 97% 07:55 96% 97%, 2018 81%, 2019
Mean Humidity 81% 85% 86%, 2020 69%, 2009
Minimum Pressure 1027 hPa 18:46 1018 hPa 1027 hPa, 2023 993 hPa, 2009
Maximum Pressure 1029 hPa 11:09 1024 hPa 1029 hPa, 2023 1003 hPa, 2009
Mean Pressure 1028 hPa 1021 hPa 1028 hPa, 2023 998 hPa, 2009
Mean Wind Speed 2.0 mph (-1.9) 2.4 mph (-1.5) 9.8 mph, 2009 1.0 mph, 2018
Maximum Wind Speed 8.3 mph 18:53 9.0 mph 23.9 mph, 2016 5.6 mph, 2012
Maximum Gust 12.7 mph 18:54 13.4 mph 33.9 mph, 2016 8.1 mph, 2012
Mean Wind Direction E
Rainfall 0.0 mm 2.2 mm (44%) 5.5 mm, 2016
Maximum Hourly Rain n/a 2.8, 2016
Maximum 10-min Rain n/a 0.8, 2016
Maximum Rain Rate n/a 6.6, 2020
Minimum Dew Point 11.8 °C 06:33 13.4 °C 12.7 °C, 2022 5.8 °C, 2009
Maximum Dew Point 18.6 °C 18:52 18.2 °C 18.6 °C, 2023 10.9 °C, 2015
Mean Dew Point 15.8 °C 16.0 °C 15.8 °C, 2023 8.6 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.7 °C 06:36 14.8 °C 15.4 °C, 2020 9.4 °C, 2015
Day Maximum (09-21) 25.7 °C 16:21 23.6 °C 25.7 °C, 2023 15.9 °C, 2015
Max 10m Temp Rise 0.6 °C 07:54 0.6 °C 1.8 °C, 2009 0.4 °C, 2020
Max 1hr Temp Rise 2.7 °C 08:38 2.0 °C 3.8 °C, 2013 1.4 °C, 2020
Max 1hr Hum Rise 11% 19:00 7% 18%, 2017 4%, 2011
Max 10m Temp Fall 0.4 °C 18:50 0.4 °C 1.4 °C, 2009 0.3 °C, 2019
Max 1hr Temp Fall 2.0 °C 19:31 1.6 °C 3.0 °C, 2012 1.2 °C, 2019
Max 1hr Hum Fall 11% 09:31 9% 26%, 2018 5%, 2021
Max 10m Wind Speed 5.6 mph 20:29 6.3 mph 18.5 mph, 2016 3.9 mph, 2018
Minimum Feels-like 14.9 °C 06:26 17.9 °C 18.0 °C, 2020 7.4 °C, 2015
Maximum Feels-like 32.0 °C 16:14 29.6 °C 32.0 °C, 2023 17.4 °C, 2015
Mean Feels-like 23.8 °C 23.4 °C 23.8 °C, 2023 13.0 °C, 2015
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 (+4.6) 8.8 °C (+0.4) 13.0 °C (+4.6), 2023 5.7 °C (-2.7), 2020
Humidity Range 36% 27% 56%, 2012 10%, 2020
Pressure Range 2 hPa 7 hPa 10 hPa, 2009 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11 [90%]18 hrs (114%) [49%] 11 [90%], 2023 0 [0%], 2017
Wet Hours 02 hrs (49%) [2.8%] 7, 2016 0, 2010
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 21.6 °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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