Daily Report for 10th March 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.3 °C (-4.2) 21:00 1.6 °C (-2.1) 10.2 °C (+6.3), 2020 -0.3 °C (-4.2), 2023
Maximum Temperature 9.3 °C (-1.0) 00:51 7.0 °C (-3.1) 15.7 °C (+5.4), 2022 3.0 °C (-7.3), 2013
Mean Temperature 4.0 °C (-2.6) 4.2 °C (-2.6) 12.6 °C, 2020 1.9 °C, 2013
Minimum Humidity 71% 17:11 76% 92%, 2024 40%, 2019
Maximum Humidity 96% 01:54 91% 97%, 2009 77%, 2010
Mean Humidity 87% 85% 94%, 2024 67%, 2015
Minimum Pressure 982 hPa 02:44 1008 hPa 1035 hPa, 2012 982 hPa, 2023
Maximum Pressure 1011 hPa 22:35 1017 hPa 1039 hPa, 2012 998 hPa, 2018
Mean Pressure 998 hPa 1013 hPa 1037 hPa, 2012 996 hPa, 2018
Mean Wind Speed 6.1 mph (+0.9) 4.5 mph (-0.7) 12.8 mph, 2021 2.6 mph, 2016
Maximum Wind Speed 21.8 mph 11:02 13.1 mph 29.0 mph, 2019 8.3 mph, 2024
Maximum Gust 30.0 mph 09:46 18.7 mph 47.2 mph, 2019 11.5 mph, 2024
Mean Wind Direction NNE
Rainfall / Snow-melt approx. 2.2 mm 21.5 mm (171%) 9.9 mm, 2024
Maximum Hourly Rain 0.8 mm 01:15 3.5 mm, 2019
Maximum 10-min Rain 0.3 mm 08:58 1.1 mm, 2019
Maximum Rain Rate 1.0 mm/h 00:29 7 mm/h, 2019
Minimum Dew Point -2.6 °C 23:53 -0.6 °C 8.1 °C, 2020 -3.4 °C, 2019
Maximum Dew Point 8.7 °C 00:51 4.2 °C 11.9 °C, 2020 -0.1 °C, 2010
Mean Dew Point 1.9 °C 1.8 °C 10.3 °C, 2020 -1.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 1.9 °C * 08:57 1.9 °C 8.7 °C, 2012 1.9 °C, 2013
Day Maximum (09-21) * 4.6 °C * 16:13 6.4 °C 15.7 °C, 2022 3.0 °C, 2013
Max 10m Temp Rise 0.5 °C 10:42 0.4 °C 0.9 °C, 2019 0.1 °C, 2013
Max 1hr Temp Rise 1.1 °C 10:42 1.2 °C 2.7 °C, 2014 0.4 °C, 2013
Max 1hr Hum Rise 9% 19:59 6% 30%, 2019 2%, 2024
Max 10m Temp Fall 0.6 °C 19:35 0.4 °C 1.7 °C, 2019 0.2 °C, 2010
Max 1hr Temp Fall 2.5 °C 04:48 1.1 °C 4.6 °C, 2019 0.4 °C, 2021
Max 1hr Hum Fall 7% 13:18 6% 22%, 2019 2%, 2010
Max 10m Wind Speed 15.6 mph 11:03 9.8 mph 20.3 mph, 2019 6.3 mph, 2016
Minimum Feels-like -5.7 °C 09:46 -2.8 °C 10.9 °C, 2020 -7.2 °C, 2013
Maximum Feels-like 10.0 °C 01:10 6.6 °C 17.1 °C, 2020 0.5 °C, 2013
Mean Feels-like 1.2 °C 1.8 °C 14.0 °C, 2020 -2.5 °C, 2013
Air-frost Hrs 2 hrs 0.6 hrs 2 hrs, 2023 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.6 °C (+3.2) 5.4 °C (-1.0) 9.6 °C (+3.2), 2023 1.9 °C (-4.5), 2024
Humidity Range 25% 16% 57%, 2019 4%, 2024
Pressure Range 29 hPa 10 hPa 29 hPa, 2023 3 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [10%]8.6 hrs (25%) [8.5%] 9 [87%], 2015 0 [0%], 2013
Wet Hours 4
[Mean rain rate: 0.6 mm/h]		30 hrs (175%) [13%] 14, 2024 , 2009
Cloud Cover unknown
Events Snowfall: ~0.3 cm
Comments sleet sh 10
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 5.2 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 10th March 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

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Webcam Summary of Cloud Conditions

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Wind rose