Daily Report for 8th December 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.5 °C (+3.0) 22:21 3.2 °C (-0.3) 10.7 °C (+7.2), 2016 -1.5 °C (-5.0), 2010
Maximum Temperature 11.2 °C (+2.8) 05:22 9.1 °C (+0.5) 13.5 °C (+5.1), 2015 2.0 °C (-6.4), 2010
Mean Temperature 9.1 °C (+2.9) 6.1 °C (+0.1) 12.1 °C, 2016 0.0 °C, 2010
Minimum Humidity 67% 14:10 77% 92%, 2020 62%, 2014
Maximum Humidity 94% 05:09 94% 98%, 2009 79%, 2016
Mean Humidity 81% 87% 94%, 2020 76%, 2014
Minimum Pressure 992 hPa 23:54 1013 hPa 1024 hPa, 2013 992 hPa, 2019
Maximum Pressure 1006 hPa 00:00 1022 hPa 1030 hPa, 2015 1006 hPa, 2019
Mean Pressure 1000 hPa 1018 hPa 1026 hPa, 2016 1000 hPa, 2019
Mean Wind Speed 11.1 mph (+6.0) 5.8 mph (+0.7) 11.1 mph, 2019 1.5 mph, 2020
Maximum Wind Speed 21.3 mph 15:18 14.3 mph 22.5 mph, 2011 7.0 mph, 2020
Maximum Gust 33.4 mph 15:18 22.4 mph 36.5 mph, 2011 11.4 mph, 2020
Mean Wind Direction SW
Rainfall 2.4 mm 9.4 mm (66%) 2.6 mm, 2015
Maximum Hourly Rain 1.8 mm 02:27 1.8 mm, 2019
Maximum 10-min Rain 0.7 mm 02:01 0.8 mm, 2015
Maximum Rain Rate 4.4 mm/h 02:01 18 mm/h, 2020
Minimum Dew Point 3.0 °C 21:02 1.4 °C 7.0 °C, 2016 -5.6 °C, 2010
Maximum Dew Point 10.3 °C 05:24 6.8 °C 11.8 °C, 2015 0.7 °C, 2017
Mean Dew Point 5.9 °C 4.0 °C 8.4 °C, 2016 -1.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.5 °C * 08:19 4.0 °C 11.6 °C, 2015 -1.5 °C, 2010
Day Maximum (09-21) * 10.5 °C * 13:39 8.9 °C 13.5 °C, 2015 2.0 °C, 2010
Max 10m Temp Rise 0.2 °C 04:09 0.4 °C 1.0 °C, 2011 0.2 °C, 2009
Max 1hr Temp Rise 0.6 °C 04:09 1.2 °C 2.3 °C, 2013 0.6 °C, 2019
Max 1hr Hum Rise 8% 16:30 5% 8%, 2019 1%, 2016
Max 10m Temp Fall 0.4 °C 15:33 0.3 °C 0.4 °C, 2019 0.1 °C, 2009
Max 1hr Temp Fall 1.9 °C 16:24 1.2 °C 1.9 °C, 2019 0.5 °C, 2009
Max 1hr Hum Fall 12% 06:11 6% 13%, 2014 1%, 2016
Max 10m Wind Speed 16.6 mph 12:16 10.8 mph 16.6 mph, 2019 5.5 mph, 2020
Minimum Feels-like 1.3 °C 21:45 -1.0 °C 10.7 °C, 2016 -7.5 °C, 2010
Maximum Feels-like 12.6 °C 05:10 9.4 °C 15.6 °C, 2015 1.7 °C, 2017
Mean Feels-like 7.3 °C 4.5 °C 12.7 °C, 2016 -3.9 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 13 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.7 °C (-0.3) 5.9 °C (+0.8) 8.9 °C (+3.9), 2011 2.4 °C (-2.6), 2016
Humidity Range 27% 17% 27%, 2019 2%, 2016
Pressure Range 14 hPa 9 hPa 19 hPa, 2011 3 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [28%]26 hrs (170%) [44%] 5.5 [77%], 2014 0 [0%], 2011
Wet Hours 3
[Mean rain rate: 0.8 mm/h]
13 hrs (81%) [6.8%] 5, 2015 0, 2010
Cloud Cover Partly Cloudy
Events None
Comments o.night rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.5 °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