Daily Report for 11th July 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.8 °C (-3.4) 05:37 12.7 °C (-0.1) 17.5 °C (+4.3), 2010 9.8 °C (-3.4), 2020
Maximum Temperature 20.6 °C (-1.8) 17:59 20.3 °C (-1.9) 27.9 °C (+5.5), 2010 19.4 °C (-3.0), 2012
Mean Temperature 15.4 °C (-2.6) 16.5 °C (-1.0) 21.9 °C, 2010 15.2 °C, 2012
Minimum Humidity 45% 17:59 60% 82%, 2014 33%, 2015
Maximum Humidity 85% 05:44 90% 95%, 2009 65%, 2015
Mean Humidity 67% 77% 90%, 2014 48%, 2015
Minimum Pressure 1024 hPa 00:02 1013 hPa 1024 hPa, 2020 1005 hPa, 2016
Maximum Pressure 1029 hPa 22:13 1019 hPa 1029 hPa, 2020 1011 hPa, 2012
Mean Pressure 1027 hPa 1016 hPa 1027 hPa, 2020 1008 hPa, 2016
Mean Wind Speed 3.1 mph (-1.2) 6.3 mph (+2.0) 11.2 mph, 2016 2.2 mph, 2011
Maximum Wind Speed 11.5 mph 14:12 15.6 mph 23.7 mph, 2016 7.8 mph, 2014
Maximum Gust 15.0 mph 11:07 24.3 mph 38.7 mph, 2016 12.3 mph, 2011
Mean Wind Direction NNW
Rainfall 0.0 mm 25.7 mm (161%) 29.7 mm, 2017
Maximum Hourly Rain n/a 6.6, 2017
Maximum 10-min Rain n/a 4.8, 2017
Maximum Rain Rate n/a 54, 2016
Minimum Dew Point 7.3 °C 05:30 9.7 °C 11.4 °C, 2016 6.0 °C, 2013
Maximum Dew Point 11.0 °C 10:07 14.3 °C 16.8 °C, 2014 9.3 °C, 2013
Mean Dew Point 8.9 °C 12.1 °C 13.9 °C, 2009 7.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.8 °C 05:37 13.1 °C 17.5 °C, 2010 9.8 °C, 2020
Day Maximum (09-21) 20.6 °C 18:00 20.3 °C 27.9 °C, 2010 19.4 °C, 2012
Max 10m Temp Rise 0.6 °C 14:41 0.6 °C 0.9 °C, 2013 0.3 °C, 2014
Max 1hr Temp Rise 2.7 °C 07:57 2.0 °C 2.9 °C, 2011 1.0 °C, 2014
Max 1hr Hum Rise 12% 21:18 11% 18%, 2012 4%, 2014
Max 10m Temp Fall 0.7 °C 15:01 0.7 °C 0.9 °C, 2009 0.3 °C, 2014
Max 1hr Temp Fall 3.0 °C 21:39 2.2 °C 3.0 °C, 2012 1.2 °C, 2009
Max 1hr Hum Fall 9% 08:38 10% 15%, 2012 4%, 2014
Max 10m Wind Speed 6.8 mph 14:19 11.5 mph 18.0 mph, 2016 5.2 mph, 2014
Minimum Feels-like 8.3 °C 05:39 13.9 °C 20.1 °C, 2010 8.3 °C, 2020
Maximum Feels-like 21.4 °C 18:00 23.0 °C 30.4 °C, 2010 20.8 °C, 2012
Mean Feels-like 16.2 °C 18.9 °C 24.5 °C, 2010 16.2 °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 10.8 °C (+1.5) 7.5 °C (-1.8) 11.5 °C (+2.2), 2011 5.0 °C (-4.3), 2017
Humidity Range 40% 30% 52%, 2011 12%, 2014
Pressure Range 5 hPa 6 hPa 6 hPa, 2016 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [67%]44 hrs (66%) [27%] 12.5 [84%], 2015 0 [0%], 2014
Wet Hours 032 hrs (265%) [12%] 8, 2017 0, 2010
Cloud Cover am: Sunny transitioned to Mostly Sunny
pm: Partly Cloudy transitioned to Mostly Sunny
Events None
Comments -
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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Wind rose