Daily Report for 26th May 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.8 °C (-3.5) 05:35 7.2 °C (-1.6) 14.9 °C (+4.6), 2018 5.1 °C (-5.2), 2013
Maximum Temperature 16.1 °C (-2.7) 15:06 14.8 °C (-2.8) 26.7 °C (+7.9), 2017 14.7 °C (-4.1), 2014
Mean Temperature 11.3 °C (-3.1) 10.8 °C (-2.2) 20.5 °C, 2017 11.3 °C, 2021
Minimum Humidity 52% 15:09 55% 67%, 2022 29%, 2012
Maximum Humidity 90% 01:59 90% 94%, 2009 75%, 2010
Mean Humidity 77% 76% 83%, 2014 50%, 2013
Minimum Pressure 1014 hPa 02:29 1005 hPa 1035 hPa, 2020 1005 hPa, 2011
Maximum Pressure 1019 hPa 23:29 1013 hPa 1038 hPa, 2020 1012 hPa, 2010
Mean Pressure 1016 hPa 1009 hPa 1036 hPa, 2020 1009 hPa, 2011
Mean Wind Speed 3.5 mph (-1.2) 5.3 mph (+0.6) 7.9 mph, 2009 2.3 mph, 2020
Maximum Wind Speed 13.7 mph 12:35 16.3 mph 20.1 mph, 2011 8.5 mph, 2014
Maximum Gust 19.4 mph 12:35 24.6 mph 28.5 mph, 2022 12.7 mph, 2020
Mean Wind Direction NW
Rainfall 0.0 mm 71.6 mm (186%) 14.5 mm, 2011
Maximum Hourly Rain n/a 5.2, 2011
Maximum 10-min Rain n/a 3.8, 2011
Maximum Rain Rate n/a 80, 2011
Minimum Dew Point 4.7 °C 04:58 4.0 °C 13.1 °C, 2018 0.3 °C, 2013
Maximum Dew Point 9.0 °C 20:51 8.8 °C 18.5 °C, 2018 4.0 °C, 2013
Mean Dew Point 7.2 °C 6.5 °C 15.2 °C, 2018 2.1 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.8 °C 05:35 7.4 °C 15.1 °C, 2019 5.1 °C, 2013
Day Maximum (09-21) 16.1 °C 14:56 14.8 °C 26.7 °C, 2017 14.7 °C, 2014
Max 10m Temp Rise 0.7 °C 14:40 0.6 °C 0.8 °C, 2013 0.3 °C, 2014
Max 1hr Temp Rise 2.1 °C 12:06 2.1 °C 3.7 °C, 2020 1.2 °C, 2011
Max 1hr Hum Rise 11% 16:07 15% 15%, 2020 4%, 2022
Max 10m Temp Fall 0.5 °C 15:36 0.8 °C 1.1 °C, 2019 0.3 °C, 2010
Max 1hr Temp Fall 1.4 °C 16:06 2.1 °C 4.5 °C, 2020 1.2 °C, 2022
Max 1hr Hum Fall 10% 12:12 12% 21%, 2012 6%, 2010
Max 10m Wind Speed 9.4 mph 13:38 12.4 mph 13.1 mph, 2011 6.1 mph, 2015
Minimum Feels-like 4.3 °C 03:19 4.8 °C 17.8 °C, 2018 3.0 °C, 2013
Maximum Feels-like 16.5 °C 14:40 15.3 °C 31.0 °C, 2018 15.9 °C, 2014
Mean Feels-like 11.1 °C 10.6 °C 23.8 °C, 2018 11.1 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.3 °C (+0.7) 7.6 °C (-1.2) 15.3 °C (+6.7), 2020 4.2 °C (-4.4), 2011
Humidity Range 38% 35% 58%, 2012 22%, 2019
Pressure Range 5 hPa 8 hPa 15 hPa, 2009 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2.5 [17%]92 hrs (58%) [25%] 14.6 [100%], 2012 0 [0%], 2014
Wet Hours 066 hrs (197%) [11%] 10, 2014 0, 2010
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 15.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 26th May 2021.
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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Webcam Summary of Cloud Conditions

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