Daily Report for 14th December 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.4 °C (+1.2) 07:58 3.0 °C (-0.4) 8.6 °C (+5.4), 2020 -0.9 °C (-4.1), 2010
Maximum Temperature 8.8 °C (+0.8) 21:50 9.0 °C (+0.6) 14.6 °C (+6.6), 2016 3.8 °C (-4.2), 2018
Mean Temperature 6.1 °C (+1.0) 6.2 °C (+0.1) 10.5 °C, 2016 2.7 °C, 2018
Minimum Humidity 61% 14:01 76% 89%, 2009 61%, 2019
Maximum Humidity 92% 00:54 93% 98%, 2009 80%, 2011
Mean Humidity 80% 86% 95%, 2009 75%, 2011
Minimum Pressure 982 hPa 00:12 1002 hPa 1027 hPa, 2010 975 hPa, 2012
Maximum Pressure 996 hPa 16:38 1016 hPa 1037 hPa, 2010 993 hPa, 2017
Mean Pressure 990 hPa 1010 hPa 1032 hPa, 2010 985 hPa, 2012
Mean Wind Speed 8.5 mph (+3.4) 6.4 mph (+1.3) 8.5 mph, 2019 1.5 mph, 2009
Maximum Wind Speed 23.4 mph 12:54 16.3 mph 23.4 mph, 2019 4.3 mph, 2009
Maximum Gust 42.6 mph 12:55 26.4 mph 42.6 mph, 2019 6.2 mph, 2009
Mean Wind Direction WSW
Rainfall 11.0 mm 40.4 mm (163%) 11.0 mm, 2019
Maximum Hourly Rain 5.9 mm 22:40 5.9 mm, 2019
Maximum 10-min Rain 2.6 mm 22:36 2.6 mm, 2019
Maximum Rain Rate 26 mm/h 22:31 26 mm/h, 2019
Minimum Dew Point 0.2 °C 14:01 1.0 °C 7.2 °C, 2020 -3.6 °C, 2010
Maximum Dew Point 6.4 °C 22:31 6.8 °C 10.3 °C, 2020 0.0 °C, 2018
Mean Dew Point 2.9 °C 3.9 °C 8.6 °C, 2020 -1.1 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.4 °C 05:35 3.9 °C 9.3 °C, 2020 0.4 °C, 2012
Day Maximum (09-21) * 7.7 °C * 15:58 8.8 °C 14.6 °C, 2016 3.8 °C, 2018
Max 10m Temp Rise 0.4 °C 10:42 0.4 °C 1.0 °C, 2016 0.2 °C, 2010
Max 1hr Temp Rise 1.7 °C 10:53 1.3 °C 2.6 °C, 2016 0.6 °C, 2010
Max 1hr Hum Rise 9% 22:31 6% 9%, 2013 2%, 2015
Max 10m Temp Fall 0.5 °C 12:10 0.4 °C 0.5 °C, 2019 0.1 °C, 2014
Max 1hr Temp Fall 1.3 °C 23:10 1.3 °C 1.7 °C, 2020 0.2 °C, 2014
Max 1hr Hum Fall 13% 13:11 6% 13%, 2019 2%, 2015
Max 10m Wind Speed 19.3 mph 13:00 12.3 mph 19.3 mph, 2019 3.4 mph, 2009
Minimum Feels-like -1.5 °C 06:03 -1.5 °C 5.7 °C, 2015 -3.5 °C, 2014
Maximum Feels-like 6.7 °C 22:58 8.7 °C 15.7 °C, 2016 3.8 °C, 2018
Mean Feels-like 2.4 °C 4.0 °C 10.6 °C, 2016 -0.4 °C, 2017
Air-frost Hrs 0 hrs 0 hrs 1 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.4 °C (-0.3) 6.0 °C (+1.0) 8.8 °C (+4.1), 2012 1.9 °C (-2.8), 2011
Humidity Range 31% 17% 31%, 2019 8%, 2020
Pressure Range 13 hPa 14 hPa 24 hPa, 2012 3 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [50%]41 hrs (156%) [41%] 5 [71%], 2016 0 [0%], 2012
Wet Hours 5
[Mean rain rate: 2.2 mm/h]
41 hrs (146%) [12%] 7, 2020 0, 2016
Cloud Cover am: Mostly Cloudy
pm: Sunny
Events None
Comments rn
Extra Comments rainbow 1200
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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