Daily Report for 26th December 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.3 °C (-1.6) 00:48 4.0 °C (+0.8) 14.0 °C (+11.1), 2015 -4.5 °C (-7.4), 2010
Maximum Temperature 9.3 °C (+2.0) 13:05 9.3 °C (+1.4) 14.9 °C (+7.6), 2015 2.5 °C (-4.8), 2010
Mean Temperature 6.7 °C (+0.2) 6.9 °C (+1.1) 14.4 °C, 2015 -1.2 °C, 2010
Minimum Humidity 86% 08:02 78% 86%, 2009 52%, 2016
Maximum Humidity 96% 04:31 94% 98%, 2009 82%, 2016
Mean Humidity 92% 87% 97%, 2013 68%, 2016
Minimum Pressure 1011 hPa 13:28 998 hPa 1031 hPa, 2011 979 hPa, 2017
Maximum Pressure 1025 hPa 00:00 1012 hPa 1042 hPa, 2016 999 hPa, 2013
Mean Pressure 1017 hPa 1006 hPa 1032 hPa, 2011 993 hPa, 2017
Mean Wind Speed 5.9 mph (+0.8) 6.0 mph (+0.9) 11.3 mph, 2015 1.8 mph, 2018
Maximum Wind Speed 18.8 mph 15:19 15.2 mph 24.7 mph, 2020 5.8 mph, 2018
Maximum Gust 30.0 mph 15:19 25.1 mph 39.3 mph, 2013 10.4 mph, 2018
Mean Wind Direction SSW
Rainfall 4.4 mm 92.4 mm (200%) 10.7 mm, 2014
Maximum Hourly Rain 2.2 mm 13:22 3.7 mm, 2017
Maximum 10-min Rain 0.7 mm 13:22 1.0 mm, 2014
Maximum Rain Rate 3.3 mm/h 13:22 18 mm/h, 2014
Minimum Dew Point 0.4 °C 00:44 2.2 °C 9.2 °C, 2015 -6.3 °C, 2010
Maximum Dew Point 8.3 °C 13:51 7.1 °C 12.4 °C, 2015 -0.8 °C, 2010
Mean Dew Point 5.3 °C 4.8 °C 10.5 °C, 2015 -3.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 0.9 °C * 22:14 4.7 °C 14.1 °C, 2015 -4.5 °C, 2010
Day Maximum (09-21) 9.3 °C 14:06 9.2 °C 14.9 °C, 2015 1.3 °C, 2010
Max 10m Temp Rise 0.5 °C 06:05 0.3 °C 0.5 °C, 2010 0.1 °C, 2015
Max 1hr Temp Rise 1.5 °C 06:46 1.2 °C 1.7 °C, 2010 0.3 °C, 2015
Max 1hr Hum Rise 3% 09:47 5% 9%, 2017 2%, 2011
Max 10m Temp Fall 0.4 °C 23:32 0.4 °C 1.2 °C, 2016 0.2 °C, 2009
Max 1hr Temp Fall 1.3 °C 23:55 1.3 °C 3.3 °C, 2016 0.4 °C, 2015
Max 1hr Hum Fall 8% 07:00 6% 19%, 2013 2%, 2018
Max 10m Wind Speed 14.5 mph 15:26 11.6 mph 19.4 mph, 2020 4.5 mph, 2018
Minimum Feels-like -4.0 °C 01:07 -0.1 °C 14.9 °C, 2015 -9.4 °C, 2010
Maximum Feels-like 9.3 °C 17:58 9.1 °C 17.0 °C, 2015 2.0 °C, 2010
Mean Feels-like 4.3 °C 4.8 °C 15.9 °C, 2015 -2.4 °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 8.0 °C (+3.6) 5.3 °C (+0.6) 9.4 °C (+5.0), 2020 0.9 °C (-3.5), 2015
Humidity Range 10% 16% 30%, 2016 9%, 2018
Pressure Range 13 hPa 13 hPa 36 hPa, 2020 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]69 hrs (145%) [38%] 5 [71%], 2017 0 [0%], 2014
Wet Hours 5
[Mean rain rate: 0.9 mm/h]
105 hrs (202%) [17%] 8, 2014 0, 2010
Cloud Cover Overcast
Events None
Comments rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 5.5 °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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