Daily Report for 1st September 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.7 °C (+1.4) 06:49 13.7 °C (+1.5) 14.7 °C (+2.4), 2009 6.3 °C (-6.0), 2020
Maximum Temperature 18.0 °C (-3.1) 16:23 18.0 °C (-3.0) 23.7 °C (+2.6), 2018 17.8 °C (-3.3), 2015
Mean Temperature 15.6 °C (-0.8) 15.6 °C (-0.8) 18.4 °C, 2016 13.8 °C, 2020
Minimum Humidity 72% 16:17 72% 76%, 2014 40%, 2013
Maximum Humidity 88% 06:05 88% 96%, 2020 73%, 2013
Mean Humidity 81% 81% 88%, 2014 58%, 2013
Minimum Pressure 1030 hPa 18:53 1030 hPa 1030 hPa, 2021 1003 hPa, 2009
Maximum Pressure 1033 hPa 09:33 1033 hPa 1033 hPa, 2021 1010 hPa, 2009
Mean Pressure 1032 hPa 1032 hPa 1032 hPa, 2021 1006 hPa, 2009
Mean Wind Speed 4.9 mph (+1.0) 4.9 mph (+1.0) 6.3 mph, 2009 0.3 mph, 2020
Maximum Wind Speed 11.9 mph 21:15 11.9 mph 17.3 mph, 2009 5.2 mph, 2020
Maximum Gust 19.4 mph 20:08 19.4 mph 35.6 mph, 2009 8.1 mph, 2020
Mean Wind Direction NE
Rainfall 0.0 mm 0.0 mm (0%) 4.7 mm, 2015
Maximum Hourly Rain n/a 4.5, 2015
Maximum 10-min Rain n/a 3.1, 2015
Maximum Rain Rate n/a 48, 2015
Minimum Dew Point 11.2 °C 03:38 11.2 °C 11.2 °C, 2021 3.4 °C, 2013
Maximum Dew Point 13.7 °C 12:03 13.7 °C 17.2 °C, 2014 9.8 °C, 2013
Mean Dew Point 12.4 °C 12.4 °C 13.8 °C, 2014 7.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.7 °C 06:47 13.7 °C 14.7 °C, 2009 6.3 °C, 2020
Day Maximum (09-21) 18.0 °C 16:23 18.0 °C 23.7 °C, 2018 17.8 °C, 2015
Max 10m Temp Rise 0.4 °C 10:38 0.4 °C 1.0 °C, 2010 0.4 °C, 2014
Max 1hr Temp Rise 1.4 °C 14:30 1.4 °C 4.5 °C, 2010 1.1 °C, 2015
Max 1hr Hum Rise 5% 04:39 5% 12%, 2020 4%, 2014
Max 10m Temp Fall 0.3 °C 13:20 0.3 °C 0.8 °C, 2019 0.3 °C, 2013
Max 1hr Temp Fall 0.9 °C 21:38 0.9 °C 2.8 °C, 2018 0.9 °C, 2021
Max 1hr Hum Fall 6% 14:35 6% 19%, 2020 3%, 2014
Max 10m Wind Speed 8.8 mph 19:32 8.8 mph 11.6 mph, 2009 2.9 mph, 2020
Minimum Feels-like 15.8 °C 07:05 15.8 °C 16.3 °C, 2009 6.3 °C, 2020
Maximum Feels-like 20.9 °C 14:50 20.9 °C 25.8 °C, 2018 20.5 °C, 2015
Mean Feels-like 18.0 °C 18.0 °C 20.2 °C, 2016 14.5 °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 4.3 °C (-4.5) 4.3 °C (-4.5) 13.6 °C (+4.8), 2020 4.3 °C (-4.5), 2021
Humidity Range 16% 16% 51%, 2018 16%, 2021
Pressure Range 2 hPa 2 hPa 8 hPa, 2019 2 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]0 hrs (0%) [0%] 12.2 [99%], 2010 0 [0%], 2021
Wet Hours 00 hrs (0%) [0%] 5, 2014 0, 2010
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 17.0 °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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