Daily Report for 9th December 2025

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.4 °C (+7.6) 23:33 6.3 °C (+2.4) 11.4 °C (+7.6), 2025 -2.2 °C (-6.0), 2022
Maximum Temperature 14.3 °C (+5.8) 12:56 11.7 °C (+2.9) 14.3 °C (+5.8), 2025 2.4 °C (-6.2), 2022
Mean Temperature 12.9 °C (+6.7) 9.4 °C (+2.7) 12.9 °C, 2025 -0.2 °C, 2022
Minimum Humidity 77% 13:54 80% 95%, 2009 58%, 2011
Maximum Humidity 91% 04:51 93% 98%, 2009 77%, 2011
Mean Humidity 85% 88% 97%, 2009 68%, 2011
Minimum Pressure 1002 hPa 15:42 999 hPa 1029 hPa, 2015 990 hPa, 2021
Maximum Pressure 1010 hPa 00:02 1008 hPa 1034 hPa, 2015 1004 hPa, 2021
Mean Pressure 1005 hPa 1003 hPa 1032 hPa, 2015 997 hPa, 2023
Mean Wind Speed 9.8 mph (+4.7) 6.5 mph (+1.4) 9.8 mph, 2025 2.2 mph, 2022
Maximum Wind Speed 21.1 mph 18:58 17.2 mph 23.5 mph, 2023 7.0 mph, 2022
Maximum Gust 34.6 mph 18:59 27.1 mph 34.6 mph, 2018 10.4 mph, 2022
Mean Wind Direction SW
Rainfall 6.8 mm 33.8 mm (204%) 8.4 mm, 2023
Maximum Hourly Rain 3.0 mm 04:41 3.8 mm, 2021
Maximum 10-min Rain 0.8 mm 03:55 1.2 mm, 2021
Maximum Rain Rate 4.8 mm/h 03:49 14 mm/h, 2021
Minimum Dew Point 8.3 °C 23:23 4.6 °C 8.9 °C, 2009 -6.5 °C, 2010
Maximum Dew Point 11.8 °C 16:55 9.6 °C 11.8 °C, 2025 -0.4 °C, 2017
Mean Dew Point 10.4 °C 7.4 °C 10.4 °C, 2025 -2.7 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 11.8 °C * 07:03 6.7 °C 12.7 °C, 2016 -2.2 °C, 2022
Day Maximum (09-21) 14.3 °C 12:57 11.6 °C 14.3 °C, 2025 2.4 °C, 2022
Max 10m Temp Rise 0.3 °C 12:44 0.4 °C 0.4 °C, 2013 0.1 °C, 2016
Max 1hr Temp Rise 0.7 °C 11:14 1.4 °C 2.0 °C, 2015 0.3 °C, 2016
Max 1hr Hum Rise 7% 15:43 5% 8%, 2014 1%, 2009
Max 10m Temp Fall 0.3 °C 19:10 0.4 °C 0.7 °C, 2022 0.2 °C, 2010
Max 1hr Temp Fall 0.9 °C 19:43 1.1 °C 2.5 °C, 2022 0.4 °C, 2016
Max 1hr Hum Fall 6% 11:24 6% 12%, 2023 1%, 2016
Max 10m Wind Speed 16.1 mph 19:06 12.6 mph 17.3 mph, 2023 5.6 mph, 2022
Minimum Feels-like 11.9 °C 23:23 4.7 °C 11.9 °C, 2025 -7.4 °C, 2010
Maximum Feels-like 16.2 °C 17:56 12.5 °C 16.2 °C, 2025 2.4 °C, 2022
Mean Feels-like 14.4 °C 8.8 °C 14.4 °C, 2025 -2.6 °C, 2017
Air-frost Hrs 0 hrs 0.3 hrs 16 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.9 °C (-1.9) 5.4 °C (+0.4) 11.2 °C (+6.4), 2014 1.4 °C (-3.4), 2024
Humidity Range 14% 13% 27%, 2019 3%, 2009
Pressure Range 8 hPa 10 hPa 35 hPa, 2019 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]14 hrs (74%) [22%] 7 [98%], 2019 0 [0%], 2020
Wet Hours 7
[Mean rain rate: 1.0 mm/h]		40 hrs (222%) [19%] 10, 2023 0, 2010
Cloud Cover unknown
Events None
Comments data is awaiting quality control from site operator
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 10.7 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 9th December 2025.
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