Daily Report for 8th July 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.2 °C (+0.3) 01:58 13.1 °C (-0.6) 18.6 °C (+4.8), 2023 10.8 °C (-3.0), 2014
Maximum Temperature 19.9 °C (-3.0) 14:36 20.6 °C (-2.1) 30.8 °C (+7.9), 2018 18.0 °C (-4.9), 2009
Mean Temperature 16.7 °C (-1.3) 16.8 °C (-1.3) 23.8 °C, 2018 14.8 °C, 2009
Minimum Humidity 78% 14:37 61% 78%, 2020 32%, 2017
Maximum Humidity 95% 07:09 90% 97%, 2012 75%, 2017
Mean Humidity 90% 76% 90%, 2012 54%, 2017
Minimum Pressure 1015 hPa 05:37 1012 hPa 1031 hPa, 2022 1002 hPa, 2012
Maximum Pressure 1018 hPa 00:01 1017 hPa 1034 hPa, 2022 1007 hPa, 2011
Mean Pressure 1016 hPa 1014 hPa 1033 hPa, 2022 1005 hPa, 2011
Mean Wind Speed 4.7 mph (+0.4) 7.0 mph (+2.7) 8.9 mph, 2016 1.9 mph, 2014
Maximum Wind Speed 11.4 mph 19:20 16.6 mph 22.6 mph, 2016 8.4 mph, 2021
Maximum Gust 19.6 mph 19:20 25.9 mph 38.7 mph, 2016 11.4 mph, 2021
Mean Wind Direction WSW
Rainfall 7.6 mm 21.6 mm (182%) 19.8 mm, 2012
Maximum Hourly Rain 2.2 mm 07:03 7.1 mm, 2012
Maximum 10-min Rain 0.7 mm 06:19 4.4 mm, 2023
Maximum Rain Rate 18 mm/h 04:45 42 mm/h, 2023
Minimum Dew Point 13.1 °C 01:58 9.8 °C 14.7 °C, 2023 4.6 °C, 2015
Maximum Dew Point 16.6 °C 16:29 14.6 °C 19.8 °C, 2023 12.5 °C, 2015
Mean Dew Point 15.0 °C 12.3 °C 17.5 °C, 2023 9.4 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.8 °C * 21:45 13.3 °C 18.6 °C, 2023 10.8 °C, 2014
Day Maximum (09-21) 19.9 °C 14:37 20.6 °C 30.8 °C, 2018 18.0 °C, 2009
Max 10m Temp Rise 0.5 °C 13:41 0.7 °C 1.3 °C, 2009 0.5 °C, 2011
Max 1hr Temp Rise 1.7 °C 14:27 2.1 °C 3.1 °C, 2014 1.7 °C, 2015
Max 1hr Hum Rise 4% 15:50 12% 26%, 2023 4%, 2020
Max 10m Temp Fall 0.4 °C 13:09 0.8 °C 1.0 °C, 2023 0.4 °C, 2016
Max 1hr Temp Fall 1.2 °C 20:16 2.1 °C 3.5 °C, 2023 1.2 °C, 2020
Max 1hr Hum Fall 10% 14:37 10% 18%, 2014 8%, 2022
Max 10m Wind Speed 9.4 mph 19:28 12.5 mph 18.4 mph, 2016 5.9 mph, 2021
Minimum Feels-like 17.1 °C 00:00 14.5 °C 22.5 °C, 2023 11.8 °C, 2014
Maximum Feels-like 24.7 °C 14:28 23.5 °C 34.2 °C, 2018 20.8 °C, 2011
Mean Feels-like 20.7 °C 19.3 °C 27.6 °C, 2023 16.8 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.7 °C (-3.4) 7.5 °C (-1.6) 15.3 °C (+6.2), 2018 4.5 °C (-4.6), 2011
Humidity Range 17% 29% 50%, 2018 17%, 2020
Pressure Range 3 hPa 6 hPa 12 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]31 hrs (60%) [26%] 14.4 [96%], 2013 0 [0%], 2020
Wet Hours 12
[Mean rain rate: 0.6 mm/h]		25 hrs (285%) [13%] 12, 2020 0, 2010
Cloud Cover Overcast
Events None
Comments o.night Rain, other spells
Extra Comments
Issues no pond temp - ponds still closed!
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 5.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 8th July 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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose