Daily Report for 24th December 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (+4.9) 08:06 4.3 °C (+1.0) 8.1 °C (+5.2), 2017 -1.1 °C (-4.0), 2010
Maximum Temperature 11.7 °C (+4.3) 14:18 9.4 °C (+1.3) 12.8 °C (+5.5), 2015 1.3 °C (-6.0), 2010
Mean Temperature 9.2 °C (+4.6) 7.0 °C (+1.2) 10.0 °C, 2015 0.4 °C, 2010
Minimum Humidity 77% 14:43 78% 98%, 2009 53%, 2014
Maximum Humidity 94% 05:10 94% 98%, 2009 80%, 2016
Mean Humidity 87% 87% 98%, 2009 72%, 2014
Minimum Pressure 1006 hPa 05:02 997 hPa 1025 hPa, 2018 976 hPa, 2013
Maximum Pressure 1017 hPa 23:57 1010 hPa 1036 hPa, 2018 982 hPa, 2013
Mean Pressure 1009 hPa 1004 hPa 1032 hPa, 2018 979 hPa, 2013
Mean Wind Speed 6.6 mph (+1.5) 6.1 mph (+1.0) 9.5 mph, 2015 0.8 mph, 2018
Maximum Wind Speed 17.4 mph 11:40 15.3 mph 32.9 mph, 2013 5.9 mph, 2018
Maximum Gust 32.3 mph 11:41 25.3 mph 52.6 mph, 2013 9.8 mph, 2009
Mean Wind Direction WSW
Rainfall 2.0 mm 88.0 mm (207%) 15.2 mm, 2013
Maximum Hourly Rain 1.1 mm 03:01 3.0 mm, 2013
Maximum 10-min Rain 0.7 mm 03:01 2.1 mm, 2013
Maximum Rain Rate 3.3 mm/h 02:56 36 mm/h, 2013
Minimum Dew Point 5.2 °C 23:53 2.4 °C 7.0 °C, 2017 -3.9 °C, 2010
Maximum Dew Point 8.1 °C 17:54 7.2 °C 11.0 °C, 2012 -1.0 °C, 2010
Mean Dew Point 7.1 °C 4.9 °C 8.4 °C, 2012 -2.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.7 °C * 23:01 4.9 °C 10.4 °C, 2015 -1.1 °C, 2010
Day Maximum (09-21) 11.7 °C 14:21 9.2 °C 12.8 °C, 2015 1.3 °C, 2010
Max 10m Temp Rise 0.3 °C 09:47 0.3 °C 0.5 °C, 2012 0.1 °C, 2014
Max 1hr Temp Rise 1.1 °C 11:42 1.2 °C 2.3 °C, 2012 0.3 °C, 2014
Max 1hr Hum Rise 6% 17:57 5% 8%, 2013 0%, 2009
Max 10m Temp Fall 0.3 °C 15:49 0.4 °C 1.4 °C, 2013 0.1 °C, 2009
Max 1hr Temp Fall 0.9 °C 19:14 1.3 °C 2.2 °C, 2013 0.5 °C, 2017
Max 1hr Hum Fall 6% 23:14 6% 15%, 2014 0%, 2009
Max 10m Wind Speed 12.4 mph 11:47 11.7 mph 23.8 mph, 2013 4.3 mph, 2018
Minimum Feels-like 3.6 °C 01:07 0.1 °C 5.5 °C, 2012 -6.0 °C, 2010
Maximum Feels-like 12.0 °C 14:12 9.1 °C 13.5 °C, 2015 0.6 °C, 2010
Mean Feels-like 7.7 °C 4.9 °C 9.3 °C, 2015 -3.1 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 4 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-0.5) 5.1 °C (+0.4) 7.1 °C (+2.7), 2014 2.1 °C (-2.3), 2017
Humidity Range 17% 16% 39%, 2014 0%, 2009
Pressure Range 12 hPa 13 hPa 22 hPa, 2020 4 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [29%]62 hrs (141%) [37%] 4.3 [62%], 2020 0 [0%], 2012
Wet Hours 4
[Mean rain rate: 0.5 mm/h]
100 hrs (208%) [17%] 11, 2012 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) 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