Daily Report for 25th March 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.2 °C (-4.8) 06:12 4.5 °C (+0.2) 8.1 °C (+3.1), 2010 0.0 °C (-5.0), 2013
Maximum Temperature 12.5 °C (+0.4) 12:10 11.1 °C (+0.2) 17.2 °C (+5.1), 2011 1.1 °C (-11.0), 2013
Mean Temperature 6.7 °C (-2.2) 7.7 °C (+0.2) 11.2 °C, 2010 0.6 °C, 2013
Minimum Humidity 29% 16:08 61% 79%, 2010 21%, 2017
Maximum Humidity 87% 06:47 88% 95%, 2010 68%, 2013
Mean Humidity 58% 77% 90%, 2010 50%, 2017
Minimum Pressure 1024 hPa 18:09 1011 hPa 1032 hPa, 2022 994 hPa, 2024
Maximum Pressure 1027 hPa 08:14 1018 hPa 1036 hPa, 2019 1003 hPa, 2010
Mean Pressure 1026 hPa 1015 hPa 1034 hPa, 2012 1000 hPa, 2010
Mean Wind Speed 3.2 mph (-2.0) 7.0 mph (+1.8) 9.8 mph, 2013 1.6 mph, 2011
Maximum Wind Speed 10.3 mph 12:11 16.7 mph 22.1 mph, 2023 7.1 mph, 2011
Maximum Gust 13.8 mph 12:18 25.7 mph 38.0 mph, 2009 8.7 mph, 2011
Mean Wind Direction E
Rainfall 0.0 mm 39.0 mm (124%) 4.9 mm, 2009
Maximum Hourly Rain n/a 2.3, 2009
Maximum 10-min Rain n/a 2.3, 2009
Maximum Rain Rate n/a 16, 2010
Minimum Dew Point -6.1 °C 16:09 1.2 °C 6.2 °C, 2010 -9.4 °C, 2017
Maximum Dew Point 1.3 °C 08:29 5.8 °C 11.8 °C, 2010 -4.4 °C, 2013
Mean Dew Point -2.0 °C 3.7 °C 9.7 °C, 2010 -5.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 0.2 °C 06:12 4.7 °C 10.7 °C, 2010 0.0 °C, 2013
Day Maximum (09-21) 12.5 °C 12:10 11.1 °C 17.2 °C, 2011 1.1 °C, 2013
Max 10m Temp Rise 1.0 °C 07:28 0.5 °C 1.3 °C, 2009 0.1 °C, 2013
Max 1hr Temp Rise 4.5 °C 08:04 1.8 °C 4.5 °C, 2020 0.3 °C, 2013
Max 1hr Hum Rise 9% 18:15 9% 10%, 2019 4%, 2013
Max 10m Temp Fall 0.4 °C 00:10 0.6 °C 1.0 °C, 2009 0.1 °C, 2013
Max 1hr Temp Fall 1.8 °C 01:03 1.6 °C 2.7 °C, 2015 0.3 °C, 2013
Max 1hr Hum Fall 19% 08:08 9% 19%, 2017 4%, 2013
Max 10m Wind Speed 7.8 mph 17:17 12.5 mph 15.2 mph, 2023 4.8 mph, 2011
Minimum Feels-like 0.2 °C 06:12 0.7 °C 5.0 °C, 2010 -7.0 °C, 2013
Maximum Feels-like 12.5 °C 12:10 10.8 °C 17.2 °C, 2011 -2.0 °C, 2013
Mean Feels-like 6.0 °C 5.7 °C 12.0 °C, 2010 -4.7 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 12.3 °C (+5.2) 6.6 °C (+0.0) 13.6 °C (+6.5), 2011 1.1 °C (-6.0), 2013
Humidity Range 58% 27% 59%, 2017 10%, 2013
Pressure Range 3 hPa 7 hPa 15 hPa, 2024 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11.3 [101%]112 hrs (124%) [42%] 11.3 [101%], 2020 0 [0%], 2013
Wet Hours 046 hrs (106%) [7.6%] 5, 2014 , 2009
Cloud Cover Sunny
Events Maximum possible sunshine
Comments -
Extra Comments
Issues no pond temp due to dumb lockdown
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 25th 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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose