Daily Report for 27th June 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.3 °C (+3.4) 23:48 12.4 °C (+1.3) 18.2 °C (+6.3), 2011 10.0 °C (-1.9), 2013
Maximum Temperature 20.6 °C (-0.8) 14:08 21.7 °C (+1.5) 31.9 °C (+10.5), 2011 20.0 °C (-1.4), 2017
Mean Temperature 17.4 °C (+1.3) 17.1 °C (+1.4) 25.4 °C, 2011 15.0 °C, 2013
Minimum Humidity 61% 14:29 52% 79%, 2021 29%, 2010
Maximum Humidity 90% 12:21 88% 94%, 2009 79%, 2015
Mean Humidity 78% 71% 87%, 2021 55%, 2010
Minimum Pressure 1004 hPa 13:35 1012 hPa 1028 hPa, 2019 1002 hPa, 2017
Maximum Pressure 1009 hPa 00:27 1017 hPa 1031 hPa, 2019 1009 hPa, 2020
Mean Pressure 1006 hPa 1014 hPa 1030 hPa, 2019 1006 hPa, 2020
Mean Wind Speed 9.3 mph (+4.9) 4.6 mph (+0.2) 9.3 mph, 2020 3.0 mph, 2017
Maximum Wind Speed 21.1 mph 16:22 13.3 mph 21.1 mph, 2020 8.7 mph, 2010
Maximum Gust 34.6 mph 12:57 20.8 mph 34.6 mph, 2020 11.5 mph, 2017
Mean Wind Direction SSW
Rainfall 2.3 mm 39.6 mm (98%) 35.8 mm, 2009
Maximum Hourly Rain 0.9 mm 07:15 33.3 mm, 2009
Maximum 10-min Rain 0.7 mm 11:50 8.0 mm, 2009
Maximum Rain Rate 18 mm/h 11:50 96 mm/h, 2009
Minimum Dew Point 10.7 °C 23:58 9.1 °C 14.1 °C, 2012 5.9 °C, 2013
Maximum Dew Point 16.0 °C 12:41 13.5 °C 18.2 °C, 2011 10.9 °C, 2013
Mean Dew Point 13.5 °C 11.3 °C 15.7 °C, 2012 8.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 16.3 °C * 04:24 12.6 °C 18.2 °C, 2011 10.0 °C, 2013
Day Maximum (09-21) 20.6 °C 14:09 21.7 °C 31.9 °C, 2011 20.0 °C, 2017
Max 10m Temp Rise 0.6 °C 12:46 0.6 °C 1.0 °C, 2009 0.2 °C, 2021
Max 1hr Temp Rise 2.4 °C 13:28 2.3 °C 3.5 °C, 2009 1.0 °C, 2021
Max 1hr Hum Rise 8% 07:03 10% 33%, 2009 5%, 2012
Max 10m Temp Fall 0.5 °C 14:21 0.7 °C 2.0 °C, 2009 0.4 °C, 2012
Max 1hr Temp Fall 1.7 °C 15:12 2.0 °C 6.5 °C, 2009 1.5 °C, 2016
Max 1hr Hum Fall 19% 13:59 13% 19%, 2020 3%, 2021
Max 10m Wind Speed 16.1 mph 19:07 9.7 mph 16.1 mph, 2020 6.1 mph, 2017
Minimum Feels-like 16.9 °C 23:58 13.3 °C 22.5 °C, 2011 10.0 °C, 2013
Maximum Feels-like 24.1 °C 14:06 24.3 °C 36.1 °C, 2011 20.6 °C, 2013
Mean Feels-like 20.5 °C 19.1 °C 29.7 °C, 2011 15.6 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.3 °C (-4.2) 9.4 °C (+0.3) 17.9 °C (+8.4), 2010 5.0 °C (-4.5), 2017
Humidity Range 29% 37% 57%, 2010 14%, 2021
Pressure Range 5 hPa 5 hPa 9 hPa, 2012 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [10%]178 hrs (111%) [44%] 14.5 [96%], 2010 0 [0%], 2017
Wet Hours 3
[Mean rain rate: 0.8 mm/h]
36 hrs (107%) [5.5%] 10, 2017 0, 2010
Cloud Cover Mostly Cloudy
Events None
Comments am Rain shs
Extra Comments
Issues None known
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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Webcam Summary of Cloud Conditions

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