Daily Report for 25th February 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.1 °C (-0.0) 23:57 4.8 °C (+1.9) 8.1 °C (+4.9), 2009 -1.6 °C (-4.8), 2016
Maximum Temperature 8.4 °C (-0.5) 14:28 10.5 °C (+2.3) 17.5 °C (+8.6), 2019 3.7 °C (-5.2), 2018
Mean Temperature 6.0 °C (-0.3) 7.7 °C (+2.1) 11.1 °C, 2011 1.0 °C, 2018
Minimum Humidity 64% 13:02 69% 84%, 2010 32%, 2019
Maximum Humidity 86% 06:55 90% 98%, 2010 79%, 2012
Mean Humidity 79% 81% 95%, 2010 65%, 2012
Minimum Pressure 996 hPa 20:29 1007 hPa 1035 hPa, 2019 978 hPa, 2010
Maximum Pressure 1006 hPa 00:02 1019 hPa 1038 hPa, 2019 991 hPa, 2010
Mean Pressure 1001 hPa 1013 hPa 1037 hPa, 2019 984 hPa, 2010
Mean Wind Speed 8.2 mph (+3.1) 8.8 mph (+3.7) 9.0 mph, 2017 1.7 mph, 2019
Maximum Wind Speed 17.5 mph 18:34 20.8 mph 18.2 mph, 2024 8.9 mph, 2019
Maximum Gust 27.6 mph 16:53 34.1 mph 27.6 mph, 2020 11.5 mph, 2019
Mean Wind Direction WSW
Rainfall 0.5 mm 68.8 mm (177%) 7.4 mm, 2010
Maximum Hourly Rain 0.2 mm 2.5 mm, 2010
Maximum 10-min Rain 0.2 mm 0.8 mm, 2010
Maximum Rain Rate n/a 6, 2010
Minimum Dew Point 0.0 °C 23:56 1.7 °C 6.0 °C, 2011 -7.5 °C, 2018
Maximum Dew Point 4.2 °C 01:35 7.4 °C 10.6 °C, 2011 -2.4 °C, 2018
Mean Dew Point 2.6 °C 4.7 °C 8.3 °C, 2011 -5.0 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 4.8 °C * 06:01 5.7 °C 9.5 °C, 2021 -1.3 °C, 2016
Day Maximum (09-21) 8.4 °C 14:28 10.3 °C 17.5 °C, 2019 3.7 °C, 2018
Max 10m Temp Rise 0.4 °C 08:23 0.4 °C 0.8 °C, 2019 0.1 °C, 2013
Max 1hr Temp Rise 1.0 °C 08:32 1.4 °C 3.0 °C, 2019 0.5 °C, 2009
Max 1hr Hum Rise 12% 17:22 7% 16%, 2019 3%, 2011
Max 10m Temp Fall 0.8 °C 17:06 0.5 °C 1.1 °C, 2023 0.1 °C, 2013
Max 1hr Temp Fall 2.4 °C 17:45 1.4 °C 2.8 °C, 2022 0.4 °C, 2013
Max 1hr Hum Fall 7% 11:49 9% 17%, 2019 5%, 2017
Max 10m Wind Speed 13.2 mph 12:08 15.4 mph 14.2 mph, 2021 5.8 mph, 2016
Minimum Feels-like -2.2 °C 23:59 0.3 °C 5.4 °C, 2011 -7.5 °C, 2018
Maximum Feels-like 5.8 °C 13:14 10.3 °C 17.5 °C, 2019 0.1 °C, 2018
Mean Feels-like 2.3 °C 5.6 °C 11.2 °C, 2011 -4.0 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 8 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.3 °C (-0.5) 5.7 °C (+0.5) 15.7 °C (+9.9), 2019 1.3 °C (-4.5), 2009
Humidity Range 22% 22% 60%, 2019 13%, 2009
Pressure Range 10 hPa 12 hPa 15 hPa, 2022 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [21%]68 hrs (98%) [31%] 9.5 [100%], 2018 0 [0%], 2009
Wet Hours 2
[Mean rain rate: 0.2 mm/h]		70 hrs (155%) [12%] 6, 2010 , 2009
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments eve Rain
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 6.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 25th February 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