Daily Report for 31st August 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.6 °C (+1.2) 06:44 14.3 °C (+1.1) 16.1 °C (+3.7), 2009 6.7 °C (-5.7), 2012
Maximum Temperature 22.8 °C (+1.6) 14:23 23.9 °C (+1.7) 25.4 °C (+4.2), 2009 15.7 °C (-5.5), 2015
Mean Temperature 17.4 °C (+1.4) 19.0 °C (+1.4) 19.4 °C, 2009 12.5 °C, 2020
Minimum Humidity 54% 14:10 51% 89%, 2015 34%, 2009
Maximum Humidity 91% 07:04 90% 96%, 2009 80%, 2012
Mean Humidity 74% 72% 92%, 2015 57%, 2013
Minimum Pressure 1010 hPa 13:32 1012 hPa 1029 hPa, 2021 1003 hPa, 2009
Maximum Pressure 1018 hPa 00:00 1018 hPa 1032 hPa, 2021 1016 hPa, 2009
Mean Pressure 1013 hPa 1015 hPa 1030 hPa, 2021 1010 hPa, 2009
Mean Wind Speed 5.2 mph (+1.2) 5.0 mph (+1.0) 5.2 mph, 2019 0.2 mph, 2020
Maximum Wind Speed 15.6 mph 16:27 13.5 mph 16.8 mph, 2012 5.3 mph, 2020
Maximum Gust 26.5 mph 16:33 21.5 mph 26.5 mph, 2019 7.8 mph, 2011
Mean Wind Direction WSW
Rainfall trace 36.9 mm (74%) 17.5, 2015
Maximum Hourly Rain n/a 9.3, 2015
Maximum 10-min Rain n/a 3.9, 2015
Maximum Rain Rate n/a 54, 2015
Minimum Dew Point 9.0 °C 23:33 11.3 °C 12.8 °C, 2015 2.7 °C, 2012
Maximum Dew Point 14.8 °C 15:18 15.7 °C 17.9 °C, 2009 7.8 °C, 2012
Mean Dew Point 12.4 °C 13.5 °C 13.5 °C, 2009 4.6 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.6 °C 06:44 14.5 °C 16.1 °C, 2009 6.7 °C, 2012
Day Maximum (09-21) 22.8 °C 14:24 23.9 °C 25.4 °C, 2009 15.4 °C, 2015
Max 10m Temp Rise 0.5 °C 08:12 0.7 °C 0.8 °C, 2010 0.2 °C, 2015
Max 1hr Temp Rise 2.4 °C 08:43 2.5 °C 3.9 °C, 2010 0.8 °C, 2015
Max 1hr Hum Rise 14% 17:19 12% 14%, 2019 2%, 2015
Max 10m Temp Fall 1.5 °C 16:40 0.7 °C 1.5 °C, 2019 0.2 °C, 2015
Max 1hr Temp Fall 4.7 °C 17:19 2.2 °C 4.7 °C, 2019 0.6 °C, 2015
Max 1hr Hum Fall 11% 12:47 12% 15%, 2009 1%, 2015
Max 10m Wind Speed 12.9 mph 16:35 10.1 mph 12.9 mph, 2019 2.6 mph, 2020
Minimum Feels-like 15.0 °C 23:51 16.6 °C 17.8 °C, 2009 4.2 °C, 2012
Maximum Feels-like 25.9 °C 15:07 27.3 °C 28.4 °C, 2009 17.6 °C, 2020
Mean Feels-like 19.8 °C 22.1 °C 22.7 °C, 2009 12.6 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.2 °C (+0.4) 9.6 °C (+0.6) 11.3 °C (+2.5), 2012 1.6 °C (-7.2), 2015
Humidity Range 37% 39% 62%, 2009 4%, 2015
Pressure Range 8 hPa 5 hPa 13 hPa, 2009 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6.5 [52%]205 hrs (110%) [50%] 11 [89%], 2010 0 [0%], 2015
Wet Hours 0.335 hrs (93%) [4.7%] 12, 2015 0, 2009
Cloud Cover am: Sunny
pm: Mostly Cloudy transitioned to Partly Cloudy
Events None
Comments 16 Shower
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 21.0 °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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