Daily Report for 12th March 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.7 °C (+1.6) 00:04 1.6 °C (-2.1) 9.3 °C (+5.2), 2017 -2.2 °C (-6.3), 2013
Maximum Temperature 13.3 °C (+2.8) 13:53 7.6 °C (-2.5) 14.9 °C (+4.4), 2014 3.9 °C (-6.6), 2013
Mean Temperature 10.0 °C (+2.2) 4.6 °C (-2.3) 11.2 °C, 2017 0.7 °C, 2013
Minimum Humidity 74% 14:49 74% 90%, 2024 28%, 2015
Maximum Humidity 96% 02:06 92% 97%, 2024 76%, 2015
Mean Humidity 89% 85% 93%, 2024 50%, 2015
Minimum Pressure 997 hPa 23:57 1007 hPa 1034 hPa, 2012 986 hPa, 2018
Maximum Pressure 1010 hPa 09:42 1016 hPa 1036 hPa, 2012 1000 hPa, 2018
Mean Pressure 1006 hPa 1012 hPa 1035 hPa, 2012 990 hPa, 2018
Mean Wind Speed 8.2 mph (+3.0) 4.7 mph (-0.5) 11.4 mph, 2020 1.5 mph, 2017
Maximum Wind Speed 18.3 mph 23:51 13.5 mph 25.6 mph, 2013 6.4 mph, 2014
Maximum Gust 32.3 mph 23:37 19.9 mph 39.3 mph, 2013 8.7 mph, 2014
Mean Wind Direction W
Rainfall 1.0 mm 23.5 mm (156%) 11.8 mm, 2024
Maximum Hourly Rain 0.3 mm 23:15 4.2 mm, 2019
Maximum 10-min Rain 0.3 mm 23:15 2.6 mm, 2019
Maximum Rain Rate n/a 53, 2019
Minimum Dew Point 4.8 °C 00:04 -0.4 °C 6.7 °C, 2009 -10.3 °C, 2013
Maximum Dew Point 10.7 °C 23:30 4.8 °C 12.1 °C, 2024 -0.9 °C, 2013
Mean Dew Point 8.1 °C 2.2 °C 9.0 °C, 2024 -6.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 4.1 °C * 21:08 1.7 °C 9.3 °C, 2017 -2.2 °C, 2013
Day Maximum (09-21) 13.3 °C 13:53 7.1 °C 14.9 °C, 2014 3.9 °C, 2013
Max 10m Temp Rise 0.4 °C 13:32 0.5 °C 0.8 °C, 2020 0.3 °C, 2019
Max 1hr Temp Rise 1.5 °C 08:32 1.3 °C 2.8 °C, 2020 0.8 °C, 2019
Max 1hr Hum Rise 6% 15:49 7% 17%, 2020 2%, 2024
Max 10m Temp Fall 0.3 °C 15:36 0.4 °C 1.8 °C, 2019 0.2 °C, 2017
Max 1hr Temp Fall 1.1 °C 16:14 1.2 °C 4.1 °C, 2019 0.5 °C, 2024
Max 1hr Hum Fall 5% 08:21 6% 19%, 2020 2%, 2024
Max 10m Wind Speed 15.1 mph 23:55 10.1 mph 20.6 mph, 2013 3.8 mph, 2016
Minimum Feels-like 2.3 °C 00:19 -2.5 °C 9.0 °C, 2017 -10.8 °C, 2013
Maximum Feels-like 14.3 °C 13:58 7.3 °C 15.0 °C, 2024 1.7 °C, 2013
Mean Feels-like 9.4 °C 2.4 °C 11.5 °C, 2017 -4.7 °C, 2013
Air-frost Hrs 0 hrs 1 hrs 9 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.6 °C (+1.2) 6.0 °C (-0.4) 11.9 °C (+5.5), 2014 3.1 °C (-3.4), 2017
Humidity Range 22% 18% 48%, 2015 7%, 2024
Pressure Range 13 hPa 10 hPa 22 hPa, 2019 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [10%]12 hrs (28%) [9.5%] 10 [96%], 2012 0 [0%], 2009
Wet Hours 3
[Mean rain rate: 0.3 mm/h]
35 hrs (171%) [12%] 10, 2024 , 2009
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 5.3 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 12th 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