Daily Report for 7th January 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -1.4 °C (-3.9) 21:08 0.4 °C (-2.1) 8.7 °C (+6.2), 2014 -5.3 °C (-7.8), 2010
Maximum Temperature 2.9 °C (-4.1) 13:53 4.3 °C (-2.7) 12.6 °C (+5.6), 2020 0.1 °C (-6.9), 2010
Mean Temperature 0.4 °C (-4.0) 2.4 °C (-2.4) 10.3 °C, 2014 -2.6 °C, 2010
Minimum Humidity 77% 14:36 82% 93%, 2011 59%, 2009
Maximum Humidity 93% 05:23 93% 98%, 2011 80%, 2009
Mean Humidity 89% 89% 97%, 2011 68%, 2012
Minimum Pressure 1018 hPa 23:44 1017 hPa 1030 hPa, 2017 977 hPa, 2016
Maximum Pressure 1020 hPa 01:25 1020 hPa 1038 hPa, 2019 1000 hPa, 2016
Mean Pressure 1019 hPa 1018 hPa 1032 hPa, 2019 988 hPa, 2016
Mean Wind Speed 3.1 mph (-2.1) 4.3 mph (-0.9) 9.5 mph, 2014 2.5 mph, 2017
Maximum Wind Speed 7.9 mph 13:32 10.6 mph 21.9 mph, 2014 7.9 mph, 2021
Maximum Gust 11.4 mph 13:03 16.6 mph 34.2 mph, 2016 10.5 mph, 2017
Mean Wind Direction NW
Rainfall 0.0 mm 1.3 mm (10%) 11.8 mm, 2016
Maximum Hourly Rain n/a 3.9, 2016
Maximum 10-min Rain n/a 2.4, 2014
Maximum Rain Rate n/a 54, 2014
Minimum Dew Point -2.6 °C 20:10 -1.0 °C 6.5 °C, 2013 -6.3 °C, 2010
Maximum Dew Point 0.1 °C 13:32 2.4 °C 11.3 °C, 2020 -1.7 °C, 2010
Mean Dew Point -1.2 °C 0.8 °C 7.9 °C, 2020 -3.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * -0.3 °C * 04:39 1.2 °C 9.9 °C, 2014 -5.3 °C, 2010
Day Maximum (09-21) 2.9 °C 13:54 4.3 °C 12.4 °C, 2020 0.1 °C, 2010
Max 10m Temp Rise 0.3 °C 12:25 0.3 °C 0.4 °C, 2010 0.2 °C, 2012
Max 1hr Temp Rise 1.1 °C 12:49 0.9 °C 1.8 °C, 2015 0.6 °C, 2012
Max 1hr Hum Rise 5% 15:35 4% 10%, 2014 1%, 2011
Max 10m Temp Fall 0.4 °C 17:22 0.3 °C 0.9 °C, 2016 0.1 °C, 2013
Max 1hr Temp Fall 1.3 °C 17:28 0.9 °C 2.8 °C, 2016 0.3 °C, 2017
Max 1hr Hum Fall 6% 12:32 4% 14%, 2016 1%, 2017
Max 10m Wind Speed 6.8 mph 13:40 8.8 mph 16.1 mph, 2014 6.5 mph, 2017
Minimum Feels-like -5.8 °C 21:47 -4.4 °C 5.2 °C, 2012 -11.5 °C, 2010
Maximum Feels-like 2.9 °C 14:10 3.8 °C 14.5 °C, 2020 0.0 °C, 2010
Mean Feels-like -1.9 °C -0.3 °C 9.8 °C, 2014 -6.3 °C, 2010
Air-frost Hrs 8 hrs 2 hrs 22 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.3 °C (-0.3) 3.9 °C (-0.6) 9.5 °C (+4.9), 2011 2.1 °C (-2.5), 2013
Humidity Range 16% 11% 26%, 2016 4%, 2017
Pressure Range 2 hPa 3 hPa 23 hPa, 2016 2 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [42%]7 hrs (54%) [14%] 6.7 [93%], 2018 0 [0%], 2009
Wet Hours 05 hrs (33%) [3%] 9, 2016 , 2009
Cloud Cover unknown
Events Air Frost
Comments blr
Extra Comments
Issues None known
Observer Absent? No
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