Daily Report for 6th September 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.2 °C (-1.7) 06:56 11.7 °C (-0.4) 19.3 °C (+7.4), 2016 5.6 °C (-6.3), 2015
Maximum Temperature 17.9 °C (-2.7) 17:27 19.8 °C (-1.0) 27.0 °C (+6.4), 2021 17.9 °C (-2.7), 2011
Mean Temperature 13.8 °C (-2.2) 15.6 °C (-0.7) 21.3 °C, 2016 12.3 °C, 2015
Minimum Humidity 70% 12:12 50% 77%, 2011 37%, 2012
Maximum Humidity 86% 22:22 85% 96%, 2021 77%, 2009
Mean Humidity 78% 70% 87%, 2016 60%, 2012
Minimum Pressure 1019 hPa 18:55 1018 hPa 1026 hPa, 2015 1000 hPa, 2010
Maximum Pressure 1028 hPa 00:13 1025 hPa 1030 hPa, 2012 1010 hPa, 2013
Mean Pressure 1022 hPa 1022 hPa 1028 hPa, 2015 1008 hPa, 2010
Mean Wind Speed 5.4 mph (+1.5) 5.5 mph (+1.6) 9.8 mph, 2011 0.4 mph, 2021
Maximum Wind Speed 18.4 mph 12:11 14.9 mph 21.0 mph, 2011 4.6 mph, 2021
Maximum Gust 31.1 mph 12:10 24.4 mph 33.9 mph, 2011 6.4 mph, 2014
Mean Wind Direction WSW
Rainfall trace 6.0 mm (61%) 21.7, 2011
Maximum Hourly Rain n/a 18.4, 2011
Maximum 10-min Rain n/a 7.4, 2011
Maximum Rain Rate n/a 100, 2011
Minimum Dew Point 7.7 °C 02:12 6.6 °C 16.8 °C, 2016 4.1 °C, 2015
Maximum Dew Point 13.3 °C 18:40 12.6 °C 19.7 °C, 2016 10.1 °C, 2015
Mean Dew Point 10.0 °C 9.8 °C 19.0 °C, 2016 6.6 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.2 °C 06:56 11.8 °C 19.9 °C, 2016 5.6 °C, 2015
Day Maximum (09-21) 17.9 °C 17:46 19.8 °C 27.0 °C, 2021 16.9 °C, 2013
Max 10m Temp Rise 0.5 °C 11:33 0.6 °C 0.9 °C, 2012 0.2 °C, 2011
Max 1hr Temp Rise 1.9 °C 11:48 2.1 °C 4.7 °C, 2012 0.8 °C, 2011
Max 1hr Hum Rise 7% 21:12 8% 15%, 2012 3%, 2016
Max 10m Temp Fall 0.3 °C 22:00 0.5 °C 0.7 °C, 2021 0.3 °C, 2013
Max 1hr Temp Fall 1.7 °C 22:02 1.6 °C 3.3 °C, 2021 1.0 °C, 2018
Max 1hr Hum Fall 9% 11:59 12% 19%, 2012 5%, 2016
Max 10m Wind Speed 13.1 mph 12:11 10.7 mph 13.1 mph, 2011 2.9 mph, 2021
Minimum Feels-like 9.6 °C 02:12 11.9 °C 24.5 °C, 2016 3.9 °C, 2015
Maximum Feels-like 20.8 °C 18:40 21.5 °C 33.3 °C, 2021 18.9 °C, 2015
Mean Feels-like 15.2 °C 16.9 °C 28.1 °C, 2016 12.4 °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 7.7 °C (-1.0) 8.1 °C (-0.6) 13.7 °C (+5.0), 2012 3.9 °C (-4.8), 2016
Humidity Range 16% 35% 52%, 2012 16%, 2019
Pressure Range 9 hPa 7 hPa 20 hPa, 2016 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [8%]33 hrs (115%) [45%] 11 [91%], 2012 0 [0%], 2011
Wet Hours 0.55.5 hrs (67%) [3.8%] 5, 2011 0, 2009
Cloud Cover am: Overcast
pm: Overcast transitioned to Partly Cloudy
Events None
Comments possible lunctime Rain
Extra Comments
Issues Data glitch at 02:12. Corrected
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 19.0 °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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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