Daily Report for 26th April 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.3 °C (-3.4) 06:00 6.2 °C (+0.2) 9.3 °C (+2.6), 2012 2.1 °C (-4.6), 2016
Maximum Temperature 20.8 °C (+5.2) 17:04 18.0 °C (+3.6) 20.8 °C (+5.2), 2020 9.5 °C (-6.1), 2016
Mean Temperature 13.1 °C (+0.9) 12.1 °C (+1.9) 13.1 °C, 2020 5.3 °C, 2017
Minimum Humidity 35% 16:52 44% 65%, 2015 32%, 2009
Maximum Humidity 96% 07:27 85% 96%, 2014 78%, 2017
Mean Humidity 64% 65% 82%, 2015 59%, 2009
Minimum Pressure 1010 hPa 19:30 1018 hPa 1024 hPa, 2011 984 hPa, 2012
Maximum Pressure 1016 hPa 00:55 1024 hPa 1028 hPa, 2021 1003 hPa, 2012
Mean Pressure 1013 hPa 1021 hPa 1025 hPa, 2010 994 hPa, 2012
Mean Wind Speed 2.5 mph (-2.4) 4.6 mph (-0.3) 10.7 mph, 2012 2.5 mph, 2020
Maximum Wind Speed 8.6 mph 20:37 12.9 mph 25.1 mph, 2012 8.6 mph, 2020
Maximum Gust 15.0 mph 20:38 19.2 mph 33.4 mph, 2012 13.5 mph, 2015
Mean Wind Direction S
Rainfall 0.0 mm 2.8 mm (8%) 3.9 mm, 2013
Maximum Hourly Rain n/a 2.6, 2015
Maximum 10-min Rain n/a 0.8, 2012
Maximum Rain Rate n/a 24, 2017
Minimum Dew Point 1.7 °C 05:43 2.7 °C 6.4 °C, 2010 -4.8 °C, 2016
Maximum Dew Point 9.2 °C 20:39 7.9 °C 11.7 °C, 2010 1.5 °C, 2016
Mean Dew Point 5.7 °C 5.2 °C 8.2 °C, 2010 -1.7 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.3 °C 06:01 6.4 °C 9.3 °C, 2012 2.1 °C, 2016
Day Maximum (09-21) 20.8 °C 17:02 17.9 °C 20.8 °C, 2020 9.5 °C, 2016
Max 10m Temp Rise 0.9 °C 07:12 0.7 °C 0.9 °C, 2017 0.3 °C, 2015
Max 1hr Temp Rise 4.7 °C 08:05 2.9 °C 4.7 °C, 2020 1.1 °C, 2015
Max 1hr Hum Rise 13% 19:46 10% 26%, 2018 5%, 2011
Max 10m Temp Fall 0.6 °C 19:54 0.6 °C 1.4 °C, 2017 0.3 °C, 2023
Max 1hr Temp Fall 2.4 °C 20:13 2.1 °C 2.8 °C, 2019 0.8 °C, 2023
Max 1hr Hum Fall 23% 08:27 12% 28%, 2018 7%, 2017
Max 10m Wind Speed 7.0 mph 20:38 9.6 mph 16.2 mph, 2012 6.1 mph, 2011
Minimum Feels-like 3.3 °C 05:43 4.2 °C 6.1 °C, 2010 -3.2 °C, 2016
Maximum Feels-like 20.8 °C 17:00 18.3 °C 20.8 °C, 2020 8.0 °C, 2016
Mean Feels-like 13.1 °C 11.7 °C 13.1 °C, 2020 2.3 °C, 2016
Air-frost Hrs 0 hrs 0.2 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 17.5 °C (+8.6) 11.8 °C (+3.5) 17.5 °C (+8.6), 2020 5.1 °C (-3.8), 2012
Humidity Range 61% 42% 61%, 2020 19%, 2011
Pressure Range 5 hPa 6 hPa 19 hPa, 2012 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13 [99%]230 hrs (166%) [71%] 13 [99%], 2020 0 [0%], 2015
Wet Hours 03.5 hrs (9%) [0.6%] 3.5, 2013 0, 2009
Cloud Cover am: Sunny
pm: Sunny transitioned to Mostly Sunny
Events Maximum possible sunshine
Comments -
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 26th April 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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