Daily Report for 12th April 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.1 °C (+5.3) 04:56 6.6 °C (+1.0) 11.1 °C (+5.3), 2020 0.7 °C (-5.1), 2021
Maximum Temperature 24.9 °C (+10.8) 14:29 18.7 °C (+5.0) 24.9 °C (+10.8), 2020 9.7 °C (-4.4), 2021
Mean Temperature 17.2 °C (+8.0) 12.8 °C (+3.0) 17.2 °C, 2020 4.5 °C, 2021
Minimum Humidity 32% 14:44 42% 92%, 2009 32%, 2020
Maximum Humidity 81% 23:55 85% 97%, 2009 75%, 2015
Mean Humidity 58% 64% 95%, 2009 54%, 2015
Minimum Pressure 1012 hPa 17:22 1019 hPa 1028 hPa, 2024 989 hPa, 2023
Maximum Pressure 1021 hPa 00:12 1025 hPa 1033 hPa, 2021 999 hPa, 2023
Mean Pressure 1016 hPa 1022 hPa 1030 hPa, 2021 994 hPa, 2023
Mean Wind Speed 4.0 mph (-0.9) 4.0 mph (-0.9) 9.6 mph, 2023 1.3 mph, 2021
Maximum Wind Speed 15.4 mph 14:53 12.9 mph 27.5 mph, 2023 7.9 mph, 2021
Maximum Gust 24.2 mph 14:57 18.9 mph 47.2 mph, 2023 13.7 mph, 2021
Mean Wind Direction WNW
Rainfall trace 0.3 mm (2%) 10.2, 2013
Maximum Hourly Rain n/a 3.8, 2012
Maximum 10-min Rain n/a 2.3, 2012
Maximum Rain Rate n/a 20, 2012
Minimum Dew Point 6.5 °C 14:54 3.1 °C 8.2 °C, 2009 -4.8 °C, 2021
Maximum Dew Point 10.3 °C 11:16 8.4 °C 14.5 °C, 2024 1.5 °C, 2021
Mean Dew Point 8.4 °C 5.7 °C 10.8 °C, 2024 -1.6 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.1 °C 04:55 7.0 °C 11.1 °C, 2020 0.7 °C, 2021
Day Maximum (09-21) 24.9 °C 14:38 18.7 °C 24.9 °C, 2020 9.7 °C, 2021
Max 10m Temp Rise 0.7 °C 10:46 0.8 °C 1.0 °C, 2009 0.4 °C, 2010
Max 1hr Temp Rise 2.9 °C 09:01 3.2 °C 3.4 °C, 2012 1.2 °C, 2009
Max 1hr Hum Rise 19% 23:13 10% 20%, 2012 2%, 2009
Max 10m Temp Fall 1.8 °C 15:02 0.6 °C 2.0 °C, 2015 0.3 °C, 2010
Max 1hr Temp Fall 5.1 °C 15:45 2.2 °C 5.1 °C, 2015 0.5 °C, 2009
Max 1hr Hum Fall 13% 11:32 13% 19%, 2016 2%, 2009
Max 10m Wind Speed 11.4 mph 14:54 9.4 mph 23.2 mph, 2023 6.1 mph, 2021
Minimum Feels-like 11.3 °C 04:39 5.4 °C 11.3 °C, 2020 -2.5 °C, 2019
Maximum Feels-like 25.3 °C 14:49 19.2 °C 25.3 °C, 2020 9.3 °C, 2019
Mean Feels-like 17.8 °C 12.8 °C 17.8 °C, 2020 3.7 °C, 2021
Air-frost Hrs 0 hrs 0.3 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.8 °C (+5.5) 12.1 °C (+4.0) 14.4 °C (+6.1), 2015 3.2 °C (-5.0), 2009
Humidity Range 49% 43% 52%, 2025 5%, 2009
Pressure Range 8 hPa 6 hPa 17 hPa, 2025 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [73%]90 hrs (145%) [62%] 11 [89%], 2011 0 [0%], 2009
Wet Hours 00.5 hrs (3%) [0.2%] 6, 2013 0, 2010
Cloud Cover am: Sunny
pm: Mostly Sunny
Events Thunder
Comments 15 Shower with distant thunder
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 12th 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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