Daily Report for 12th May 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.2 °C (-7.4) 05:25 6.4 °C (-1.6) 12.6 °C (+4.0), 2017 1.0 °C (-7.6), 2010
Maximum Temperature 15.3 °C (-2.1) 17:17 17.6 °C (+0.7) 25.5 °C (+8.1), 2024 11.4 °C (-6.0), 2010
Mean Temperature 9.1 °C (-4.8) 12.3 °C (-0.5) 19.2 °C, 2024 6.9 °C, 2010
Minimum Humidity 39% 14:36 45% 79%, 2023 34%, 2009
Maximum Humidity 88% 06:11 86% 94%, 2016 74%, 2009
Mean Humidity 61% 66% 89%, 2023 52%, 2015
Minimum Pressure 1018 hPa 23:18 1014 hPa 1033 hPa, 2012 993 hPa, 2017
Maximum Pressure 1025 hPa 00:29 1021 hPa 1040 hPa, 2019 1002 hPa, 2017
Mean Pressure 1022 hPa 1017 hPa 1036 hPa, 2019 996 hPa, 2017
Mean Wind Speed 1.9 mph (-2.8) 4.5 mph (-0.2) 7.1 mph, 2015 1.9 mph, 2020
Maximum Wind Speed 9.7 mph 17:22 13.1 mph 17.8 mph, 2015 7.6 mph, 2010
Maximum Gust 12.7 mph 15:40 20.3 mph 27.5 mph, 2015 10.9 mph, 2010
Mean Wind Direction N
Rainfall 0.0 mm 5.3 mm (30%) 27.8 mm, 2025
Maximum Hourly Rain n/a 26.4, 2025
Maximum 10-min Rain n/a 10.6, 2025
Maximum Rain Rate n/a 96, 2025
Minimum Dew Point -0.9 °C 05:09 2.8 °C 10.4 °C, 2016 -2.2 °C, 2010
Maximum Dew Point 4.3 °C 21:27 8.3 °C 16.1 °C, 2024 2.8 °C, 2010
Mean Dew Point 1.4 °C 5.7 °C 12.8 °C, 2024 0.1 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 1.2 °C 05:27 7.1 °C 14.0 °C, 2025 1.0 °C, 2010
Day Maximum (09-21) 15.3 °C 17:18 17.6 °C 25.5 °C, 2024 11.4 °C, 2010
Max 10m Temp Rise 0.9 °C 07:11 0.8 °C 0.9 °C, 2019 0.4 °C, 2018
Max 1hr Temp Rise 4.0 °C 07:42 2.9 °C 4.5 °C, 2019 1.1 °C, 2018
Max 1hr Hum Rise 11% 19:42 11% 30%, 2025 6%, 2009
Max 10m Temp Fall 0.5 °C 12:58 0.8 °C 2.0 °C, 2025 0.4 °C, 2009
Max 1hr Temp Fall 1.6 °C 18:16 2.1 °C 6.5 °C, 2025 1.3 °C, 2018
Max 1hr Hum Fall 21% 08:16 15% 22%, 2019 6%, 2023
Max 10m Wind Speed 5.4 mph 15:45 9.4 mph 14.9 mph, 2015 5.4 mph, 2020
Minimum Feels-like -0.5 °C 05:36 3.7 °C 14.5 °C, 2025 -1.0 °C, 2010
Maximum Feels-like 15.3 °C 17:15 18.2 °C 29.4 °C, 2024 11.4 °C, 2010
Mean Feels-like 8.9 °C 11.9 °C 22.0 °C, 2024 6.0 °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 14.1 °C (+5.3) 11.2 °C (+2.3) 14.1 °C (+5.3), 2020 1.4 °C (-7.4), 2016
Humidity Range 49% 41% 58%, 2019 15%, 2023
Pressure Range 8 hPa 7 hPa 9 hPa, 2019 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [64%]105 hrs (147%) [63%] 12 [86%], 2016 0.2 [1%], 2018
Wet Hours 02 hrs (13%) [0.7%] 8, 2018 0, 2009
Cloud Cover am: Sunny
pm: Partly Cloudy transitioned to Mostly Cloudy
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 12th 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