Daily Report for 14th March 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.8 °C (+2.5) 06:11 4.9 °C (+1.0) 8.9 °C (+4.6), 2024 -1.7 °C (-6.0), 2013
Maximum Temperature 12.4 °C (+1.6) 14:48 10.7 °C (+0.5) 16.6 °C (+5.8), 2024 6.1 °C (-4.7), 2013
Mean Temperature 9.5 °C (+2.1) 7.6 °C (+0.7) 12.0 °C, 2024 2.7 °C, 2013
Minimum Humidity 71% 16:11 65% 71%, 2020 30%, 2016
Maximum Humidity 93% 08:55 90% 95%, 2009 78%, 2015
Mean Humidity 82% 80% 86%, 2024 63%, 2016
Minimum Pressure 1012 hPa 23:58 1002 hPa 1031 hPa, 2017 988 hPa, 2023
Maximum Pressure 1019 hPa 00:02 1011 hPa 1034 hPa, 2012 1011 hPa, 2018
Mean Pressure 1014 hPa 1006 hPa 1032 hPa, 2017 1003 hPa, 2018
Mean Wind Speed 6.8 mph (+1.6) 7.5 mph (+2.3) 9.6 mph, 2019 2.4 mph, 2009
Maximum Wind Speed 16.5 mph 22:34 18.0 mph 22.1 mph, 2019 6.9 mph, 2012
Maximum Gust 28.8 mph 22:57 27.9 mph 40.3 mph, 2019 9.2 mph, 2012
Mean Wind Direction SSW
Rainfall 3.6 mm 37.2 mm (211%) 4.0 mm, 2019
Maximum Hourly Rain 1.7 mm 05:42 1.7 mm, 2020
Maximum 10-min Rain 0.5 mm 05:20 1.2 mm, 2023
Maximum Rain Rate 18 mm/h 05:20 30 mm/h, 2023
Minimum Dew Point 4.2 °C 01:08 2.0 °C 7.5 °C, 2024 -6.7 °C, 2016
Maximum Dew Point 8.6 °C 14:00 6.5 °C 11.6 °C, 2024 -0.2 °C, 2013
Mean Dew Point 6.6 °C 4.3 °C 9.7 °C, 2024 -3.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.8 °C 06:13 5.0 °C 8.9 °C, 2024 -1.7 °C, 2013
Day Maximum (09-21) 12.4 °C 14:48 10.7 °C 16.6 °C, 2024 6.1 °C, 2013
Max 10m Temp Rise 0.5 °C 10:07 0.5 °C 1.3 °C, 2025 0.4 °C, 2010
Max 1hr Temp Rise 2.0 °C 10:13 1.6 °C 3.8 °C, 2014 1.3 °C, 2012
Max 1hr Hum Rise 5% 18:46 10% 15%, 2023 4%, 2013
Max 10m Temp Fall 0.3 °C 19:28 0.6 °C 1.4 °C, 2023 0.2 °C, 2017
Max 1hr Temp Fall 1.0 °C 19:40 1.6 °C 3.2 °C, 2023 0.7 °C, 2013
Max 1hr Hum Fall 8% 10:18 8% 22%, 2015 5%, 2012
Max 10m Wind Speed 12.5 mph 21:20 13.4 mph 16.5 mph, 2019 5.1 mph, 2012
Minimum Feels-like 2.7 °C 07:31 1.0 °C 5.9 °C, 2024 -6.1 °C, 2013
Maximum Feels-like 12.9 °C 14:48 10.6 °C 18.3 °C, 2024 6.0 °C, 2013
Mean Feels-like 8.1 °C 5.6 °C 12.5 °C, 2024 0.6 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 8 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.6 °C (-0.9) 5.9 °C (-0.5) 13.2 °C (+6.7), 2014 5.4 °C (-1.1), 2021
Humidity Range 22% 25% 57%, 2016 18%, 2017
Pressure Range 7 hPa 9 hPa 28 hPa, 2023 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.5 [5%]48 hrs (97%) [33%] 9.5 [90%], 2014 0.3 [3%], 2017
Wet Hours 5
[Mean rain rate: 0.7 mm/h]		42 hrs (173%) [12%] 6, 2019 , 2009
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments o.night Rain, 15 sh
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 5.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 14th March 2020.
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