Daily Report for 8th January 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -1.4 °C (-3.9) 00:31 0.2 °C (-2.3) 9.9 °C (+7.5), 2020 -3.3 °C (-5.8), 2010
Maximum Temperature 1.2 °C (-5.8) 12:20 3.9 °C (-3.1) 12.3 °C (+5.3), 2020 0.2 °C (-6.8), 2010
Mean Temperature -0.1 °C (-4.8) 2.1 °C (-2.7) 11.4 °C, 2020 -1.9 °C, 2010
Minimum Humidity 90% 11:55 83% 90%, 2021 62%, 2012
Maximum Humidity 95% 23:40 93% 97%, 2010 83%, 2019
Mean Humidity 92% 90% 93%, 2010 70%, 2012
Minimum Pressure 1017 hPa 05:25 1017 hPa 1030 hPa, 2017 988 hPa, 2011
Maximum Pressure 1024 hPa 23:49 1020 hPa 1034 hPa, 2017 1001 hPa, 2016
Mean Pressure 1020 hPa 1018 hPa 1032 hPa, 2017 996 hPa, 2011
Mean Wind Speed 1.0 mph (-4.2) 3.9 mph (-1.3) 7.5 mph, 2011 0.9 mph, 2017
Maximum Wind Speed 7.4 mph 22:49 10.2 mph 19.9 mph, 2011 4.9 mph, 2017
Maximum Gust 10.3 mph 19:37 15.8 mph 33.1 mph, 2011 8.4 mph, 2017
Mean Wind Direction ENE
Rainfall 0.0 mm 1.3 mm (9%) 15.8 mm, 2015
Maximum Hourly Rain n/a 4.8, 2015
Maximum 10-min Rain n/a 2, 2015
Maximum Rain Rate n/a 24, 2015
Minimum Dew Point -2.5 °C 00:27 -1.2 °C 8.1 °C, 2020 -4.1 °C, 2010
Maximum Dew Point -0.1 °C 12:48 2.1 °C 11.2 °C, 2020 -0.9 °C, 2010
Mean Dew Point -1.2 °C 0.6 °C 9.2 °C, 2020 -2.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -1.4 °C 00:32 0.9 °C 11.1 °C, 2020 -3.3 °C, 2010
Day Maximum (09-21) 1.2 °C 12:20 3.9 °C 11.9 °C, 2020 0.2 °C, 2010
Max 10m Temp Rise 0.2 °C 01:57 0.3 °C 0.4 °C, 2010 0.1 °C, 2012
Max 1hr Temp Rise 0.7 °C 10:34 0.9 °C 1.5 °C, 2016 0.4 °C, 2012
Max 1hr Hum Rise 2% 16:03 4% 5%, 2012 1%, 2017
Max 10m Temp Fall 0.3 °C 15:24 0.3 °C 0.4 °C, 2011 0.2 °C, 2010
Max 1hr Temp Fall 0.8 °C 16:19 0.9 °C 1.5 °C, 2011 0.3 °C, 2018
Max 1hr Hum Fall 2% 10:37 4% 9%, 2011 1%, 2017
Max 10m Wind Speed 5.1 mph 19:41 8.3 mph 13.3 mph, 2011 4.3 mph, 2017
Minimum Feels-like -5.7 °C 19:37 -4.5 °C 7.7 °C, 2017 -8.9 °C, 2010
Maximum Feels-like 1.2 °C 11:24 3.4 °C 14.2 °C, 2020 0.2 °C, 2010
Mean Feels-like -1.0 °C -0.4 °C 12.2 °C, 2020 -5.4 °C, 2010
Air-frost Hrs 15 hrs 4 hrs 22 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.6 °C (-2.0) 3.8 °C (-0.8) 7.3 °C (+2.7), 2011 1.5 °C (-3.1), 2012
Humidity Range 5% 10% 28%, 2011 2%, 2017
Pressure Range 7 hPa 3 hPa 17 hPa, 2011 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]7 hrs (47%) [12%] 6 [83%], 2019 0 [0%], 2018
Wet Hours 05 hrs (29%) [2.6%] 7, 2015 , 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