Daily Report for 23rd December 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.8 °C (+5.4) 05:07 5.2 °C (+1.5) 10.8 °C (+7.4), 2014 -3.9 °C (-7.3), 2009
Maximum Temperature 11.8 °C (+4.1) 12:53 9.3 °C (+1.0) 12.9 °C (+5.2), 2012 1.9 °C (-5.8), 2010
Mean Temperature 10.5 °C (+4.7) 7.5 °C (+1.3) 11.7 °C, 2014 -0.5 °C, 2009
Minimum Humidity 77% 12:32 83% 98%, 2009 63%, 2015
Maximum Humidity 87% 05:04 95% 98%, 2009 76%, 2014
Mean Humidity 82% 90% 98%, 2009 72%, 2014
Minimum Pressure 1010 hPa 23:57 1009 hPa 1030 hPa, 2017 978 hPa, 2013
Maximum Pressure 1016 hPa 00:10 1019 hPa 1037 hPa, 2017 991 hPa, 2009
Mean Pressure 1014 hPa 1014 hPa 1033 hPa, 2017 990 hPa, 2009
Mean Wind Speed 9.8 mph (+4.7) 6.2 mph (+1.1) 12.1 mph, 2013 1.5 mph, 2009
Maximum Wind Speed 19.7 mph 06:25 14.5 mph 31.7 mph, 2013 8.1 mph, 2009
Maximum Gust 31.1 mph 06:26 22.9 mph 47.6 mph, 2013 13.8 mph, 2009
Mean Wind Direction WNW
Rainfall 0.0 mm 46.0 mm (109%) 15.2 mm, 2013
Maximum Hourly Rain n/a 6.3, 2022
Maximum 10-min Rain n/a 2, 2022
Maximum Rain Rate n/a 20, 2011
Minimum Dew Point 6.4 °C 01:37 3.5 °C 7.3 °C, 2022 -4.8 °C, 2010
Maximum Dew Point 8.9 °C 23:52 7.7 °C 12.6 °C, 2012 -1.9 °C, 2010
Mean Dew Point 7.6 °C 5.8 °C 9.8 °C, 2020 -3.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.8 °C 05:09 5.6 °C 11.8 °C, 2012 -3.9 °C, 2009
Day Maximum (09-21) 11.8 °C 13:09 9.2 °C 12.8 °C, 2014 1.9 °C, 2010
Max 10m Temp Rise 0.4 °C 06:04 0.3 °C 0.5 °C, 2022 0.1 °C, 2011
Max 1hr Temp Rise 1.3 °C 06:28 1.1 °C 1.8 °C, 2022 0.3 °C, 2012
Max 1hr Hum Rise 4% 07:50 4% 9%, 2011 0%, 2009
Max 10m Temp Fall 0.2 °C 04:39 0.3 °C 1.4 °C, 2018 0.1 °C, 2012
Max 1hr Temp Fall 0.4 °C 16:18 0.9 °C 4.2 °C, 2018 0.3 °C, 2013
Max 1hr Hum Fall 5% 06:21 5% 8%, 2014 0%, 2009
Max 10m Wind Speed 15.4 mph 20:04 10.7 mph 23.2 mph, 2013 7.2 mph, 2009
Minimum Feels-like 4.9 °C 05:08 1.8 °C 10.8 °C, 2014 -6.8 °C, 2010
Maximum Feels-like 12.2 °C 12:44 9.7 °C 15.5 °C, 2012 -1.0 °C, 2010
Mean Feels-like 9.8 °C 6.1 °C 12.4 °C, 2012 -3.5 °C, 2010
Air-frost Hrs 0 hrs 2 hrs 13 hrs, 2009 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.0 °C (-1.3) 4.1 °C (-0.5) 7.7 °C (+3.4), 2009 2.0 °C (-2.3), 2014
Humidity Range 10% 12% 27%, 2015 0%, 2009
Pressure Range 6 hPa 10 hPa 34 hPa, 2013 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.5 [7%]23 hrs (48%) [14%] 5.3 [76%], 2015 0 [0%], 2010
Wet Hours 065 hrs (142%) [12%] 13, 2013 0, 2010
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues missing pm webcam
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 7.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 23rd December 2023.
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

day graph

Webcam Summary of Cloud Conditions

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose