Daily Report for 8th September 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.9 °C (-4.9) 06:59 10.9 °C (-1.1) 16.9 °C (+5.1), 2009 6.9 °C (-4.9), 2019
Maximum Temperature 17.6 °C (-2.6) 17:29 19.2 °C (-1.3) 28.0 °C (+7.8), 2021 16.0 °C (-4.2), 2015
Mean Temperature 12.1 °C (-3.7) 15.0 °C (-1.2) 21.6 °C, 2021 12.1 °C, 2019
Minimum Humidity 43% 17:29 50% 70%, 2011 24%, 2012
Maximum Humidity 91% 07:44 85% 96%, 2014 82%, 2016
Mean Humidity 71% 70% 87%, 2010 54%, 2012
Minimum Pressure 1020 hPa 23:58 1019 hPa 1025 hPa, 2015 996 hPa, 2017
Maximum Pressure 1027 hPa 00:01 1025 hPa 1031 hPa, 2015 1007 hPa, 2017
Mean Pressure 1024 hPa 1022 hPa 1028 hPa, 2015 1000 hPa, 2017
Mean Wind Speed 2.1 mph (-1.8) 4.9 mph (+1.0) 6.6 mph, 2016 1.0 mph, 2014
Maximum Wind Speed 8.2 mph 13:41 13.4 mph 22.3 mph, 2016 5.9 mph, 2014
Maximum Gust 19.6 mph 01:07 23.2 mph 33.9 mph, 2016 7.6 mph, 2014
Mean Wind Direction N
Rainfall 0.0 mm 6.0 mm (46%) 5.7 mm, 2017
Maximum Hourly Rain n/a 4.9, 2010
Maximum 10-min Rain n/a 4.1, 2010
Maximum Rain Rate n/a 50, 2010
Minimum Dew Point 4.9 °C 17:29 6.2 °C 13.9 °C, 2020 4.0 °C, 2012
Maximum Dew Point 8.9 °C 09:36 12.0 °C 18.9 °C, 2020 8.9 °C, 2019
Mean Dew Point 6.5 °C 9.3 °C 16.3 °C, 2020 6.5 °C, 2019
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.9 °C 07:00 11.2 °C 17.8 °C, 2016 6.9 °C, 2019
Day Maximum (09-21) 17.6 °C 17:30 19.2 °C 28.0 °C, 2021 16.0 °C, 2015
Max 10m Temp Rise 0.7 °C 10:42 0.6 °C 1.2 °C, 2012 0.3 °C, 2011
Max 1hr Temp Rise 3.0 °C 08:57 2.2 °C 4.9 °C, 2012 1.0 °C, 2017
Max 1hr Hum Rise 12% 19:14 9% 16%, 2013 4%, 2020
Max 10m Temp Fall 0.6 °C 19:45 0.5 °C 1.4 °C, 2013 0.3 °C, 2015
Max 1hr Temp Fall 2.8 °C 20:02 1.7 °C 4.0 °C, 2012 1.1 °C, 2018
Max 1hr Hum Fall 15% 10:58 12% 18%, 2013 5%, 2015
Max 10m Wind Speed 5.3 mph 11:51 9.6 mph 17.7 mph, 2016 4.1 mph, 2014
Minimum Feels-like 5.3 °C 04:32 10.8 °C 21.4 °C, 2009 5.3 °C, 2019
Maximum Feels-like 17.6 °C 17:25 20.7 °C 32.8 °C, 2021 17.1 °C, 2015
Mean Feels-like 11.8 °C 16.0 °C 25.9 °C, 2021 11.8 °C, 2019
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.7 °C (+2.2) 8.4 °C (-0.3) 17.2 °C (+8.7), 2012 5.5 °C (-3.0), 2017
Humidity Range 48% 36% 60%, 2012 19%, 2011
Pressure Range 7 hPa 7 hPa 11 hPa, 2017 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [84%]47 hrs (122%) [48%] 11.7 [98%], 2014 0.3 [3%], 2010
Wet Hours 05.5 hrs (50%) [2.9%] 6, 2017 0, 2009
Cloud Cover Mostly Sunny
Events None
Comments -
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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