Daily Report for 24th December 2021

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.1 °C (+3.7) 02:01 4.6 °C (+0.9) 11.2 °C (+7.8), 2023 -1.1 °C (-4.5), 2010
Maximum Temperature 10.1 °C (+2.4) 14:10 8.8 °C (+0.5) 14.8 °C (+7.1), 2023 1.3 °C (-6.4), 2010
Mean Temperature 8.6 °C (+3.0) 6.8 °C (+0.7) 13.1 °C, 2023 0.4 °C, 2010
Minimum Humidity 89% 15:08 80% 98%, 2009 53%, 2014
Maximum Humidity 96% 05:03 93% 98%, 2009 80%, 2016
Mean Humidity 94% 87% 98%, 2009 72%, 2014
Minimum Pressure 1002 hPa 21:43 1012 hPa 1025 hPa, 2018 976 hPa, 2013
Maximum Pressure 1008 hPa 00:00 1021 hPa 1036 hPa, 2018 982 hPa, 2013
Mean Pressure 1005 hPa 1016 hPa 1032 hPa, 2018 979 hPa, 2013
Mean Wind Speed 2.2 mph (-2.9) 4.7 mph (-0.4) 12.0 mph, 2023 0.8 mph, 2018
Maximum Wind Speed 8.7 mph 02:58 12.0 mph 32.9 mph, 2013 5.9 mph, 2018
Maximum Gust 19.4 mph 01:22 20.2 mph 52.6 mph, 2013 9.8 mph, 2009
Mean Wind Direction SSW
Rainfall 20.4 mm 45.8 mm (104%) 20.4 mm, 2021
Maximum Hourly Rain 4.1 mm 20:43 4.1 mm, 2021
Maximum 10-min Rain 1.0 mm 20:01 2.1 mm, 2013
Maximum Rain Rate 7 mm/h 19:21 36 mm/h, 2013
Minimum Dew Point 6.0 °C 01:46 2.5 °C 9.0 °C, 2023 -3.9 °C, 2010
Maximum Dew Point 8.7 °C 13:09 6.9 °C 12.3 °C, 2023 -1.0 °C, 2010
Mean Dew Point 7.6 °C 4.7 °C 11.2 °C, 2023 -2.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.1 °C 02:22 5.2 °C 10.9 °C, 2023 -1.1 °C, 2010
Day Maximum (09-21) 10.1 °C 14:11 8.5 °C 14.8 °C, 2023 1.3 °C, 2010
Max 10m Temp Rise 0.3 °C 12:19 0.3 °C 0.5 °C, 2012 0.1 °C, 2014
Max 1hr Temp Rise 0.9 °C 12:34 1.0 °C 2.3 °C, 2012 0.3 °C, 2014
Max 1hr Hum Rise 3% 17:32 4% 8%, 2013 0%, 2009
Max 10m Temp Fall 0.2 °C 00:11 0.3 °C 1.4 °C, 2013 0.1 °C, 2009
Max 1hr Temp Fall 0.6 °C 01:09 0.9 °C 2.2 °C, 2013 0.5 °C, 2017
Max 1hr Hum Fall 4% 13:11 5% 15%, 2014 0%, 2009
Max 10m Wind Speed 6.6 mph 04:37 9.3 mph 23.8 mph, 2013 4.3 mph, 2018
Minimum Feels-like 2.8 °C 01:22 1.1 °C 12.1 °C, 2023 -6.0 °C, 2010
Maximum Feels-like 10.8 °C 13:07 8.8 °C 17.2 °C, 2023 0.6 °C, 2010
Mean Feels-like 7.9 °C 5.3 °C 14.9 °C, 2023 -3.1 °C, 2010
Air-frost Hrs 0 hrs 0.4 hrs 4 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.0 °C (-1.3) 4.2 °C (-0.4) 7.1 °C (+2.8), 2014 2.1 °C (-2.2), 2017
Humidity Range 7% 13% 39%, 2014 0%, 2009
Pressure Range 6 hPa 9 hPa 22 hPa, 2020 4 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]28 hrs (55%) [16%] 4.3 [62%], 2020 0 [0%], 2012
Wet Hours 9
[Mean rain rate: 2.3 mm/h]		38 hrs (79%) [6.6%] 11, 2012 0, 2010
Cloud Cover Overcast or Mostly Cloudy
Events None
Comments pm rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 6.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 24th 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose