Daily Report for 16th August 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.3 °C (-1.0) 02:05 14.7 °C (+1.1) 16.9 °C (+3.6), 2013 10.5 °C (-2.8), 2015
Maximum Temperature 19.1 °C (-3.2) 12:25 22.7 °C (+0.2) 24.4 °C (+2.1), 2020 17.8 °C (-4.5), 2021
Mean Temperature 15.9 °C (-2.1) 18.5 °C (+0.6) 20.2 °C, 2020 15.2 °C, 2015
Minimum Humidity 67% 12:25 55% 70%, 2013 41%, 2014
Maximum Humidity 94% 23:41 90% 96%, 2020 77%, 2017
Mean Humidity 85% 75% 86%, 2020 59%, 2017
Minimum Pressure 1004 hPa 23:55 1010 hPa 1017 hPa, 2016 1004 hPa, 2019
Maximum Pressure 1018 hPa 01:00 1016 hPa 1023 hPa, 2021 1014 hPa, 2020
Mean Pressure 1012 hPa 1012 hPa 1020 hPa, 2014 1012 hPa, 2020
Mean Wind Speed 6.4 mph (+2.4) 5.6 mph (+1.6) 6.4 mph, 2019 1.0 mph, 2015
Maximum Wind Speed 18.5 mph 13:25 14.3 mph 18.5 mph, 2019 8.5 mph, 2015
Maximum Gust 28.8 mph 12:24 23.6 mph 28.8 mph, 2019 11.2 mph, 2015
Mean Wind Direction SSW
Rainfall 3.7 mm 31.2 mm (121%) 15.2 mm, 2018
Maximum Hourly Rain 1.8 mm 22:58 10.0 mm, 2020
Maximum 10-min Rain 0.7 mm 22:52 3.0 mm, 2020
Maximum Rain Rate 3.3 mm/h 22:43 100 mm/h, 2020
Minimum Dew Point 9.8 °C 01:51 11.8 °C 15.0 °C, 2020 5.6 °C, 2014
Maximum Dew Point 15.6 °C 23:44 15.9 °C 19.0 °C, 2020 10.9 °C, 2014
Mean Dew Point 13.2 °C 13.7 °C 17.6 °C, 2020 8.5 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.3 °C 02:06 14.8 °C 18.6 °C, 2020 10.5 °C, 2015
Day Maximum (09-21) 19.1 °C 12:27 22.7 °C 24.4 °C, 2020 17.8 °C, 2021
Max 10m Temp Rise 0.7 °C 12:24 0.6 °C 0.7 °C, 2012 0.3 °C, 2018
Max 1hr Temp Rise 1.5 °C 08:10 2.2 °C 2.7 °C, 2017 1.2 °C, 2011
Max 1hr Hum Rise 10% 13:25 12% 14%, 2018 5%, 2010
Max 10m Temp Fall 0.4 °C 12:52 0.7 °C 0.9 °C, 2009 0.3 °C, 2013
Max 1hr Temp Fall 1.7 °C 01:49 2.0 °C 2.6 °C, 2020 1.3 °C, 2013
Max 1hr Hum Fall 7% 10:19 11% 20%, 2018 6%, 2013
Max 10m Wind Speed 13.4 mph 12:41 10.7 mph 13.4 mph, 2019 5.2 mph, 2015
Minimum Feels-like 13.5 °C 01:55 17.0 °C 20.3 °C, 2013 10.5 °C, 2015
Maximum Feels-like 22.1 °C 12:31 26.2 °C 30.3 °C, 2020 20.7 °C, 2014
Mean Feels-like 18.8 °C 21.8 °C 25.9 °C, 2020 16.0 °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 6.8 °C (-2.2) 8.0 °C (-0.9) 11.6 °C (+2.6), 2017 4.4 °C (-4.6), 2018
Humidity Range 27% 34% 50%, 2009 15%, 2011
Pressure Range 14 hPa 6 hPa 14 hPa, 2019 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]69 hrs (69%) [32%] 11 [83%], 2016 0 [0%], 2019
Wet Hours 10
[Mean rain rate: 0.4 mm/h]
29 hrs (148%) [7.6%] 10, 2019 0, 2009
Cloud Cover Overcast
Events None
Comments pm Rain
Extra Comments
Issues None known
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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Webcam Summary of Cloud Conditions

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