Daily Report for 19th April 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.4 °C (-0.7) 03:00 6.0 °C (+0.2) 11.2 °C (+5.1), 2018 2.1 °C (-4.0), 2021
Maximum Temperature 17.7 °C (+3.1) 15:18 17.4 °C (+3.5) 28.4 °C (+13.8), 2018 11.3 °C (-3.3), 2012
Mean Temperature 11.2 °C (+1.2) 11.8 °C (+1.8) 20.3 °C, 2018 7.7 °C, 2015
Minimum Humidity 38% 14:55 45% 71%, 2012 25%, 2018
Maximum Humidity 92% 03:48 85% 94%, 2012 69%, 2017
Mean Humidity 68% 66% 88%, 2012 51%, 2017
Minimum Pressure 1019 hPa 16:47 1019 hPa 1034 hPa, 2017 979 hPa, 2012
Maximum Pressure 1022 hPa 07:13 1025 hPa 1038 hPa, 2017 990 hPa, 2012
Mean Pressure 1021 hPa 1022 hPa 1036 hPa, 2017 984 hPa, 2012
Mean Wind Speed 5.2 mph (+0.3) 4.5 mph (-0.4) 8.6 mph, 2023 0.8 mph, 2021
Maximum Wind Speed 14.2 mph 17:39 12.9 mph 18.2 mph, 2025 6.7 mph, 2017
Maximum Gust 20.7 mph 12:43 19.1 mph 28.8 mph, 2025 9.4 mph, 2017
Mean Wind Direction ENE
Rainfall 0.0 mm 2.8 mm (11%) 8.4 mm, 2012
Maximum Hourly Rain n/a 2.7, 2012
Maximum 10-min Rain n/a 1.5, 2012
Maximum Rain Rate n/a 15, 2012
Minimum Dew Point 2.3 °C 17:38 2.4 °C 6.4 °C, 2018 -3.2 °C, 2017
Maximum Dew Point 7.1 °C 10:40 8.0 °C 12.0 °C, 2018 1.4 °C, 2017
Mean Dew Point 4.8 °C 5.1 °C 9.4 °C, 2018 -1.3 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.4 °C 03:00 6.4 °C 11.2 °C, 2018 2.1 °C, 2021
Day Maximum (09-21) 17.7 °C 15:19 17.4 °C 28.4 °C, 2018 11.3 °C, 2012
Max 10m Temp Rise 0.8 °C 08:39 0.8 °C 1.1 °C, 2025 0.5 °C, 2015
Max 1hr Temp Rise 2.5 °C 09:29 3.0 °C 3.4 °C, 2018 1.2 °C, 2013
Max 1hr Hum Rise 10% 21:38 10% 14%, 2019 4%, 2010
Max 10m Temp Fall 0.5 °C 19:36 0.6 °C 1.7 °C, 2024 0.3 °C, 2013
Max 1hr Temp Fall 1.8 °C 19:46 2.1 °C 3.5 °C, 2019 1.3 °C, 2023
Max 1hr Hum Fall 12% 09:30 12% 20%, 2024 7%, 2017
Max 10m Wind Speed 11.0 mph 17:39 9.6 mph 14.5 mph, 2023 4.2 mph, 2021
Minimum Feels-like 3.8 °C 04:33 4.2 °C 11.6 °C, 2018 0.4 °C, 2015
Maximum Feels-like 17.7 °C 15:16 17.8 °C 29.0 °C, 2018 11.3 °C, 2015
Mean Feels-like 10.6 °C 11.4 °C 21.4 °C, 2018 6.3 °C, 2015
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 12.3 °C (+3.8) 11.4 °C (+3.2) 17.2 °C (+8.7), 2018 4.8 °C (-3.7), 2012
Humidity Range 54% 40% 57%, 2018 23%, 2012
Pressure Range 3 hPa 6 hPa 14 hPa, 2013 2 hPa, 2025
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11 [86%]146 hrs (146%) [63%] 12.7 [100%], 2018 1 [8%], 2012
Wet Hours 03.5 hrs (12%) [0.8%] 5, 2012 0, 2009
Cloud Cover am: Mostly Cloudy transitioned to Sunny
pm: Sunny
Events None
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 19th 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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Wind rose