Daily Report for 27th May 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.5 °C (+3.0) 04:50 8.2 °C (-0.8) 15.1 °C (+4.6), 2017 7.5 °C (-3.0), 2015
Maximum Temperature 24.5 °C (+5.4) 17:32 19.9 °C (+2.2) 27.1 °C (+8.0), 2018 13.2 °C (-5.9), 2014
Mean Temperature 18.8 °C (+4.2) 14.4 °C (+0.7) 20.7 °C, 2018 11.5 °C, 2009
Minimum Humidity 49% 11:39 41% 89%, 2014 29%, 2012
Maximum Humidity 77% 05:00 84% 97%, 2014 65%, 2013
Mean Humidity 62% 63% 94%, 2014 47%, 2013
Minimum Pressure 1035 hPa 18:35 1020 hPa 1035 hPa, 2020 1004 hPa, 2013
Maximum Pressure 1037 hPa 22:37 1025 hPa 1037 hPa, 2020 1011 hPa, 2010
Mean Pressure 1036 hPa 1022 hPa 1036 hPa, 2020 1009 hPa, 2013
Mean Wind Speed 2.9 mph (-1.8) 4.5 mph (-0.2) 8.7 mph, 2025 1.6 mph, 2021
Maximum Wind Speed 10.3 mph 21:34 13.0 mph 19.2 mph, 2013 7.9 mph, 2021
Maximum Gust 16.1 mph 21:14 20.0 mph 30.0 mph, 2025 11.4 mph, 2021
Mean Wind Direction ENE
Rainfall 0.0 mm 5.5 mm (14%) 9.0 mm, 2025
Maximum Hourly Rain n/a 3.4, 2025
Maximum 10-min Rain n/a 1.8, 2018
Maximum Rain Rate n/a 40, 2018
Minimum Dew Point 7.7 °C 00:01 3.8 °C 12.8 °C, 2018 0.4 °C, 2013
Maximum Dew Point 14.0 °C 16:37 9.6 °C 19.4 °C, 2018 5.3 °C, 2013
Mean Dew Point 11.2 °C 6.9 °C 16.1 °C, 2018 2.3 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.5 °C 04:43 8.6 °C 15.1 °C, 2017 7.5 °C, 2015
Day Maximum (09-21) 24.5 °C 17:32 19.9 °C 27.1 °C, 2018 13.2 °C, 2014
Max 10m Temp Rise 0.7 °C 08:42 0.7 °C 0.9 °C, 2019 0.2 °C, 2014
Max 1hr Temp Rise 3.1 °C 09:21 2.9 °C 3.3 °C, 2018 0.6 °C, 2014
Max 1hr Hum Rise 12% 22:03 11% 15%, 2018 2%, 2014
Max 10m Temp Fall 0.6 °C 15:52 0.7 °C 1.1 °C, 2017 0.2 °C, 2009
Max 1hr Temp Fall 2.7 °C 21:56 2.3 °C 2.7 °C, 2017 0.8 °C, 2009
Max 1hr Hum Fall 12% 09:25 14% 15%, 2010 4%, 2009
Max 10m Wind Speed 8.4 mph 22:00 9.5 mph 13.5 mph, 2017 5.2 mph, 2021
Minimum Feels-like 14.5 °C 03:59 6.7 °C 16.9 °C, 2017 5.3 °C, 2013
Maximum Feels-like 27.7 °C 17:32 20.8 °C 33.7 °C, 2018 15.4 °C, 2014
Mean Feels-like 20.7 °C 14.6 °C 25.4 °C, 2018 12.3 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.0 °C (+2.5) 11.7 °C (+3.0) 13.2 °C (+4.7), 2012 2.9 °C (-5.6), 2025
Humidity Range 28% 43% 46%, 2010 8%, 2014
Pressure Range 3 hPa 5 hPa 12 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [41%]250 hrs (152%) [65%] 14.7 [100%], 2012 0 [0%], 2009
Wet Hours 02.4 hrs (7%) [0.4%] 10, 2014 0, 2011
Cloud Cover Partly Cloudy with periods of Sunny
Events None
Comments -
Extra Comments
Issues no pond temp due to covid
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 27th May 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