Daily Report for 7th July 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.9 °C (-0.8) 00:48 14.0 °C (+0.4) 18.8 °C (+5.1), 2017 9.4 °C (-4.3), 2020
Maximum Temperature 20.2 °C (-2.6) 14:09 21.3 °C (-1.3) 30.3 °C (+7.6), 2018 17.8 °C (-4.9), 2024
Mean Temperature 16.7 °C (-1.7) 17.4 °C (-0.4) 24.3 °C, 2018 14.2 °C, 2024
Minimum Humidity 69% 15:20 63% 75%, 2009 32%, 2017
Maximum Humidity 90% 05:51 92% 94%, 2019 68%, 2016
Mean Humidity 81% 79% 88%, 2009 52%, 2017
Minimum Pressure 1008 hPa 00:00 1008 hPa 1030 hPa, 2013 1002 hPa, 2009
Maximum Pressure 1018 hPa 23:53 1014 hPa 1033 hPa, 2022 1005 hPa, 2011
Mean Pressure 1013 hPa 1011 hPa 1031 hPa, 2013 1004 hPa, 2011
Mean Wind Speed 7.1 mph (+2.8) 4.3 mph (+0.0) 7.7 mph, 2011 2.4 mph, 2018
Maximum Wind Speed 14.5 mph 16:23 12.5 mph 18.1 mph, 2015 9.8 mph, 2013
Maximum Gust 21.7 mph 14:02 18.4 mph 28.4 mph, 2015 13.0 mph, 2014
Mean Wind Direction SW
Rainfall 0.0 mm 15.6 mm (150%) 7.1 mm, 2009
Maximum Hourly Rain n/a 4.4, 2024
Maximum 10-min Rain n/a 1.7, 2009
Maximum Rain Rate n/a 33, 2009
Minimum Dew Point 11.0 °C 00:48 11.7 °C 11.9 °C, 2009 4.7 °C, 2015
Maximum Dew Point 14.9 °C 13:43 15.4 °C 17.5 °C, 2018 11.1 °C, 2014
Mean Dew Point 13.2 °C 13.6 °C 15.0 °C, 2018 9.4 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.9 °C 00:48 14.1 °C 18.8 °C, 2017 9.4 °C, 2020
Day Maximum (09-21) 20.2 °C 14:34 21.3 °C 30.3 °C, 2018 17.8 °C, 2024
Max 10m Temp Rise 0.6 °C 13:45 0.7 °C 0.9 °C, 2023 0.5 °C, 2015
Max 1hr Temp Rise 1.5 °C 12:53 2.2 °C 4.2 °C, 2023 1.5 °C, 2021
Max 1hr Hum Rise 5% 21:55 10% 22%, 2020 5%, 2021
Max 10m Temp Fall 0.3 °C 11:41 0.6 °C 1.9 °C, 2024 0.3 °C, 2010
Max 1hr Temp Fall 1.4 °C 21:11 1.8 °C 4.2 °C, 2024 1.2 °C, 2010
Max 1hr Hum Fall 7% 12:51 11% 17%, 2023 7%, 2010
Max 10m Wind Speed 11.1 mph 14:35 9.3 mph 15.0 mph, 2015 7.4 mph, 2017
Minimum Feels-like 14.7 °C 00:42 16.3 °C 21.9 °C, 2017 8.0 °C, 2020
Maximum Feels-like 24.0 °C 14:06 25.2 °C 34.2 °C, 2018 20.3 °C, 2024
Mean Feels-like 19.6 °C 20.6 °C 28.3 °C, 2018 16.1 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.3 °C (-1.8) 7.3 °C (-1.8) 18.8 °C (+9.7), 2023 4.2 °C (-4.9), 2009
Humidity Range 21% 28% 54%, 2018 18%, 2009
Pressure Range 10 hPa 7 hPa 10 hPa, 2021 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]25 hrs (55%) [24%] 14.5 [97%], 2023 1 [7%], 2012
Wet Hours 015 hrs (195%) [8.9%] 5, 2020 0, 2010
Cloud Cover am: Overcast
pm: Partly Cloudy transitioned to Mostly Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 19.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 7th July 2021.
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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