Daily Report for 13th June 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.4 °C (+1.4) 05:32 10.5 °C (-0.1) 15.1 °C (+4.1), 2015 5.6 °C (-5.4), 2012
Maximum Temperature 23.8 °C (+3.7) 15:02 18.7 °C (-0.7) 28.8 °C (+8.7), 2021 14.0 °C (-6.1), 2019
Mean Temperature 18.4 °C (+2.6) 14.6 °C (-0.4) 21.7 °C, 2021 12.7 °C, 2019
Minimum Humidity 46% 14:31 53% 80%, 2019 34%, 2014
Maximum Humidity 94% 06:02 88% 95%, 2011 77%, 2017
Mean Humidity 71% 72% 88%, 2019 56%, 2014
Minimum Pressure 1007 hPa 01:19 1009 hPa 1024 hPa, 2021 999 hPa, 2016
Maximum Pressure 1014 hPa 23:41 1015 hPa 1030 hPa, 2021 1004 hPa, 2016
Mean Pressure 1010 hPa 1012 hPa 1027 hPa, 2021 1001 hPa, 2016
Mean Wind Speed 5.2 mph (+0.8) 4.4 mph (-0.0) 9.2 mph, 2013 1.3 mph, 2017
Maximum Wind Speed 16.8 mph 18:34 12.9 mph 18.5 mph, 2013 6.8 mph, 2017
Maximum Gust 26.5 mph 18:32 21.2 mph 29.1 mph, 2013 10.5 mph, 2017
Mean Wind Direction ESE
Rainfall trace 12.2 mm (63%) 4.1, 2016
Maximum Hourly Rain n/a 2, 2016
Maximum 10-min Rain n/a 1.5, 2016
Maximum Rain Rate n/a 30, 2016
Minimum Dew Point 11.0 °C 13:56 7.0 °C 12.1 °C, 2016 2.8 °C, 2012
Maximum Dew Point 13.9 °C 19:31 11.6 °C 17.6 °C, 2021 9.7 °C, 2012
Mean Dew Point 12.4 °C 9.3 °C 14.1 °C, 2021 5.8 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.4 °C 05:33 10.7 °C 15.1 °C, 2015 5.6 °C, 2012
Day Maximum (09-21) 23.8 °C 15:02 18.7 °C 28.8 °C, 2021 14.0 °C, 2019
Max 10m Temp Rise 0.7 °C 09:46 0.6 °C 1.1 °C, 2009 0.4 °C, 2011
Max 1hr Temp Rise 2.9 °C 08:30 2.1 °C 4.6 °C, 2012 1.3 °C, 2015
Max 1hr Hum Rise 14% 19:31 11% 14%, 2020 4%, 2015
Max 10m Temp Fall 1.3 °C 18:39 0.8 °C 1.3 °C, 2020 0.3 °C, 2010
Max 1hr Temp Fall 3.0 °C 19:23 1.9 °C 3.0 °C, 2020 1.0 °C, 2015
Max 1hr Hum Fall 17% 08:15 12% 24%, 2021 6%, 2015
Max 10m Wind Speed 13.6 mph 18:37 9.5 mph 14.8 mph, 2013 4.3 mph, 2014
Minimum Feels-like 14.3 °C 05:28 10.4 °C 18.1 °C, 2015 5.6 °C, 2012
Maximum Feels-like 26.2 °C 17:56 20.2 °C 34.5 °C, 2021 15.7 °C, 2019
Mean Feels-like 20.9 °C 15.6 °C 25.2 °C, 2021 13.4 °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 11.4 °C (+2.2) 8.2 °C (-0.6) 15.5 °C (+6.3), 2021 2.6 °C (-6.6), 2019
Humidity Range 48% 35% 50%, 2012 13%, 2016
Pressure Range 7 hPa 6 hPa 9 hPa, 2010 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [66%]60 hrs (78%) [31%] 15 [99%], 2021 0 [0%], 2019
Wet Hours 0.113 hrs (79%) [4%] 7, 2019 0, 2010
Cloud Cover Mostly Sunny
Events None
Comments 1930 brief Shower
Extra Comments
Issues no pond temp due to covid
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 5.0 °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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