Daily Report for 29th August 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.9 °C (+0.4) 06:54 14.3 °C (+1.1) 16.7 °C (+4.2), 2017 9.1 °C (-3.4), 2009
Maximum Temperature 22.9 °C (+1.5) 14:51 23.9 °C (+1.7) 25.3 °C (+3.9), 2017 14.7 °C (-6.7), 2020
Mean Temperature 18.2 °C (+0.9) 19.0 °C (+1.4) 20.6 °C, 2017 12.6 °C, 2020
Minimum Humidity 45% 14:10 50% 73%, 2020 41%, 2009
Maximum Humidity 85% 06:49 90% 95%, 2018 80%, 2017
Mean Humidity 68% 72% 84%, 2020 63%, 2013
Minimum Pressure 1016 hPa 00:03 1012 hPa 1025 hPa, 2021 1003 hPa, 2020
Maximum Pressure 1023 hPa 23:35 1018 hPa 1027 hPa, 2021 1013 hPa, 2014
Mean Pressure 1020 hPa 1015 hPa 1026 hPa, 2021 1009 hPa, 2020
Mean Wind Speed 5.7 mph (+1.7) 5.0 mph (+1.0) 7.2 mph, 2014 1.8 mph, 2018
Maximum Wind Speed 14.1 mph 14:34 13.4 mph 18.7 mph, 2012 7.0 mph, 2017
Maximum Gust 20.7 mph 01:07 21.4 mph 26.5 mph, 2020 12.5 mph, 2015
Mean Wind Direction WSW
Rainfall 0.0 mm 36.8 mm (79%) 9.9 mm, 2018
Maximum Hourly Rain n/a 4, 2018
Maximum 10-min Rain n/a 2, 2012
Maximum Rain Rate n/a 60, 2012
Minimum Dew Point 10.1 °C 14:10 11.4 °C 12.2 °C, 2017 3.0 °C, 2010
Maximum Dew Point 15.2 °C 01:12 15.8 °C 15.6 °C, 2016 10.0 °C, 2009
Mean Dew Point 11.8 °C 13.5 °C 13.5 °C, 2017 7.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.9 °C 06:53 14.5 °C 16.7 °C, 2017 9.1 °C, 2009
Day Maximum (09-21) 22.9 °C 15:08 23.9 °C 25.3 °C, 2017 14.7 °C, 2020
Max 10m Temp Rise 0.6 °C 10:51 0.7 °C 0.8 °C, 2013 0.3 °C, 2020
Max 1hr Temp Rise 2.4 °C 10:23 2.5 °C 3.0 °C, 2013 1.2 °C, 2020
Max 1hr Hum Rise 9% 20:04 12% 21%, 2010 5%, 2011
Max 10m Temp Fall 0.9 °C 01:39 0.7 °C 1.8 °C, 2012 0.3 °C, 2015
Max 1hr Temp Fall 2.5 °C 02:24 2.1 °C 4.2 °C, 2012 0.8 °C, 2014
Max 1hr Hum Fall 13% 09:36 12% 37%, 2010 5%, 2020
Max 10m Wind Speed 10.2 mph 17:21 10.0 mph 14.2 mph, 2012 5.2 mph, 2018
Minimum Feels-like 14.3 °C 07:03 16.7 °C 19.1 °C, 2017 7.6 °C, 2009
Maximum Feels-like 24.8 °C 14:53 27.3 °C 28.9 °C, 2017 16.1 °C, 2020
Mean Feels-like 20.4 °C 22.2 °C 23.7 °C, 2017 13.8 °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 10.0 °C (+1.1) 9.6 °C (+0.6) 10.2 °C (+1.3), 2009 3.6 °C (-5.3), 2020
Humidity Range 40% 40% 52%, 2009 19%, 2020
Pressure Range 7 hPa 5 hPa 12 hPa, 2020 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [72%]188 hrs (107%) [49%] 10 [80%], 2013 0.3 [2%], 2018
Wet Hours 035 hrs (98%) [5%] 5, 2018 0, 2009
Cloud Cover am: Sunny
pm: Partly Cloudy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 22.0 °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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