Daily Report for 1st December 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.5 °C (-1.6) 23:58 2.5 °C (-1.5) 10.9 °C (+6.8), 2024 -2.4 °C (-6.5), 2012
Maximum Temperature 10.7 °C (+1.3) 00:37 10.7 °C (+1.4) 14.0 °C (+4.7), 2015 -0.1 °C (-9.4), 2010
Mean Temperature 7.7 °C (-0.1) 7.7 °C (-0.1) 12.3 °C, 2015 -0.7 °C, 2010
Minimum Humidity 72% 13:12 72% 91%, 2024 57%, 2010
Maximum Humidity 91% 01:28 91% 98%, 2012 80%, 2016
Mean Humidity 83% 83% 93%, 2024 71%, 2010
Minimum Pressure 995 hPa 03:57 995 hPa 1031 hPa, 2013 995 hPa, 2021
Maximum Pressure 1008 hPa 23:58 1008 hPa 1034 hPa, 2013 1008 hPa, 2021
Mean Pressure 1000 hPa 1000 hPa 1032 hPa, 2013 1000 hPa, 2021
Mean Wind Speed 8.8 mph (+3.7) 8.8 mph (+3.7) 10.4 mph, 2010 1.9 mph, 2013
Maximum Wind Speed 18.9 mph 07:40 18.9 mph 20.6 mph, 2011 6.2 mph, 2022
Maximum Gust 30.8 mph 05:17 30.8 mph 30.8 mph, 2021 8.7 mph, 2013
Mean Wind Direction NW
Rainfall 2.4 mm 2.4 mm (131%) 6.4 mm, 2018
Maximum Hourly Rain 2.4 mm 14:42 2.6 mm, 2018
Maximum 10-min Rain 1.5 mm 14:25 1.5 mm, 2021
Maximum Rain Rate 14 mm/h 14:20 14 mm/h, 2021
Minimum Dew Point -0.9 °C 23:58 -0.9 °C 9.7 °C, 2024 -8.0 °C, 2010
Maximum Dew Point 9.3 °C 01:06 9.3 °C 12.4 °C, 2024 -2.1 °C, 2010
Mean Dew Point 5.0 °C 5.0 °C 10.8 °C, 2024 -5.3 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.8 °C * 08:12 7.8 °C 10.9 °C, 2024 -2.4 °C, 2012
Day Maximum (09-21) * 9.6 °C * 13:13 9.6 °C 14.0 °C, 2015 -0.1 °C, 2010
Max 10m Temp Rise 0.3 °C 10:55 0.3 °C 1.0 °C, 2015 0.1 °C, 2010
Max 1hr Temp Rise 0.9 °C 11:38 0.9 °C 2.6 °C, 2015 0.2 °C, 2014
Max 1hr Hum Rise 13% 14:50 13% 13%, 2021 2%, 2024
Max 10m Temp Fall 1.1 °C 14:29 1.1 °C 1.1 °C, 2021 0.1 °C, 2010
Max 1hr Temp Fall 2.6 °C 14:44 2.6 °C 2.6 °C, 2021 0.3 °C, 2010
Max 1hr Hum Fall 6% 05:34 6% 12%, 2012 3%, 2018
Max 10m Wind Speed 14.8 mph 11:27 14.8 mph 14.8 mph, 2021 4.7 mph, 2022
Minimum Feels-like -2.3 °C 23:35 -2.3 °C 12.0 °C, 2024 -8.4 °C, 2010
Maximum Feels-like 11.7 °C 01:06 11.7 °C 15.8 °C, 2015 -3.3 °C, 2010
Mean Feels-like 5.3 °C 5.3 °C 13.5 °C, 2024 -6.1 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 24 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.2 °C (+2.9) 8.2 °C (+3.0) 8.2 °C (+2.9), 2021 0.9 °C (-4.4), 2010
Humidity Range 19% 19% 33%, 2010 5%, 2024
Pressure Range 13 hPa 13 hPa 14 hPa, 2018 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2.4 [33%]2.4 hrs (111%) [33%] 7 [96%], 2020 0 [0%], 2010
Wet Hours 1
[Mean rain rate: 2.4 mm/h]		1 hrs (50%) [4.2%] 7, 2011 0, 2012
Cloud Cover Partly Cloudy with periods of Overcast
Events None
Comments sh
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 6.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 1st December 2021.
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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