Daily Report for 10th December 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.4 °C (+1.7) 00:14 2.4 °C (-1.4) 9.5 °C (+5.8), 2015 -3.3 °C (-7.0), 2022
Maximum Temperature 7.6 °C (-0.8) 23:35 5.9 °C (-2.8) 13.7 °C (+5.3), 2016 2.6 °C (-5.8), 2017
Mean Temperature 6.6 °C (+0.5) 4.3 °C (-2.1) 12.0 °C, 2016 -1.0 °C, 2022
Minimum Humidity 85% 05:48 84% 86%, 2022 53%, 2014
Maximum Humidity 93% 23:37 94% 98%, 2013 79%, 2016
Mean Humidity 88% 89% 92%, 2017 71%, 2014
Minimum Pressure 993 hPa 23:59 996 hPa 1030 hPa, 2013 972 hPa, 2017
Maximum Pressure 1003 hPa 10:44 1007 hPa 1033 hPa, 2009 1003 hPa, 2020
Mean Pressure 1000 hPa 1002 hPa 1031 hPa, 2013 982 hPa, 2017
Mean Wind Speed 4.7 mph (-0.4) 2.9 mph (-2.2) 9.4 mph, 2021 2.5 mph, 2022
Maximum Wind Speed 10.5 mph 14:19 9.1 mph 23.0 mph, 2014 7.6 mph, 2022
Maximum Gust 16.0 mph 14:48 14.3 mph 33.7 mph, 2014 11.5 mph, 2022
Mean Wind Direction SSE
Rainfall 0.2 mm 25.5 mm (139%) 20.5 mm, 2017
Maximum Hourly Rain 0.2 mm 5.1 mm, 2017
Maximum 10-min Rain 0.2 mm 2.0 mm, 2019
Maximum Rain Rate n/a 40, 2019
Minimum Dew Point 3.2 °C 00:14 0.9 °C 6.0 °C, 2015 -4.2 °C, 2022
Maximum Dew Point 6.5 °C 23:37 4.2 °C 10.4 °C, 2014 0.6 °C, 2011
Mean Dew Point 4.8 °C 2.6 °C 8.3 °C, 2016 -2.1 °C, 2022
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.4 °C 00:14 2.8 °C 11.2 °C, 2016 -2.3 °C, 2022
Day Maximum (09-21) * 7.3 °C * 20:42 5.8 °C 13.7 °C, 2016 1.0 °C, 2017
Max 10m Temp Rise 0.4 °C 01:56 0.3 °C 0.7 °C, 2017 0.2 °C, 2012
Max 1hr Temp Rise 0.9 °C 02:18 1.0 °C 2.3 °C, 2013 0.4 °C, 2016
Max 1hr Hum Rise 3% 22:52 3% 11%, 2017 2%, 2016
Max 10m Temp Fall 0.2 °C 08:30 0.3 °C 0.7 °C, 2013 0.2 °C, 2010
Max 1hr Temp Fall 0.3 °C 07:08 0.8 °C 2.5 °C, 2016 0.3 °C, 2020
Max 1hr Hum Fall 3% 02:36 3% 24%, 2014 3%, 2012
Max 10m Wind Speed 7.6 mph 14:22 6.9 mph 17.6 mph, 2014 5.7 mph, 2022
Minimum Feels-like 2.0 °C 01:15 -0.9 °C 6.6 °C, 2015 -7.5 °C, 2022
Maximum Feels-like 7.6 °C 23:08 5.7 °C 14.8 °C, 2016 2.3 °C, 2017
Mean Feels-like 4.2 °C 2.6 °C 12.4 °C, 2016 -3.0 °C, 2022
Air-frost Hrs 0 hrs 0.5 hrs 18 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.2 °C (-2.5) 3.5 °C (-1.4) 9.5 °C (+4.9), 2019 2.2 °C (-2.5), 2020
Humidity Range 8% 10% 39%, 2014 4%, 2016
Pressure Range 10 hPa 11 hPa 32 hPa, 2017 1 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]14 hrs (66%) [20%] 6.5 [92%], 2011 0 [0%], 2010
Wet Hours 0.528 hrs (138%) [11%] 12, 2017 0, 2010
Cloud Cover Overcast
Events None
Comments late rn
Extra Comments
Issues wind from harpenden
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 6.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 10th December 2020.
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 derived based on analysis of webcam observations, but may use data from our closest site, Heathrow, when needed.
Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually.
Rainfall totals may be manually adjusted after the fact to correct delayed or erroneous data.
Cloud cover and Events are manually reported, often with multi-week delays.
Data is generally reliable and accurate but should always be viewed with some quantity of salt to hand.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose