Daily Report for 13th July 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.4 °C (+1.2) 00:25 14.1 °C (+0.3) 18.7 °C (+4.5), 2022 11.8 °C (-2.4), 2016
Maximum Temperature 22.6 °C (-0.5) 14:45 21.4 °C (-1.4) 30.3 °C (+7.2), 2013 17.2 °C (-5.9), 2011
Mean Temperature 18.2 °C (+0.4) 17.5 °C (-0.5) 24.2 °C, 2022 14.6 °C, 2011
Minimum Humidity 67% 15:00 64% 78%, 2015 32%, 2020
Maximum Humidity 95% 04:11 92% 96%, 2012 77%, 2017
Mean Humidity 83% 80% 87%, 2015 54%, 2017
Minimum Pressure 1013 hPa 00:42 1011 hPa 1023 hPa, 2013 1000 hPa, 2012
Maximum Pressure 1018 hPa 22:10 1017 hPa 1028 hPa, 2020 1006 hPa, 2012
Mean Pressure 1016 hPa 1014 hPa 1024 hPa, 2013 1002 hPa, 2012
Mean Wind Speed 2.2 mph (-2.1) 3.1 mph (-1.2) 6.3 mph, 2009 1.6 mph, 2024
Maximum Wind Speed 9.4 mph 16:22 10.7 mph 16.9 mph, 2016 7.7 mph, 2019
Maximum Gust 13.7 mph 14:22 15.4 mph 26.0 mph, 2009 12.6 mph, 2017
Mean Wind Direction NNE
Rainfall 0.0 mm 60.0 mm (311%) 16.9 mm, 2018
Maximum Hourly Rain 0.0 mm 01:01 13.4 mm, 2018
Maximum 10-min Rain n/a 13:27 4.8, 2018
Maximum Rain Rate n/a 00:14 40, 2018
Minimum Dew Point 13.4 °C 23:56 11.8 °C 14.6 °C, 2015 5.1 °C, 2011
Maximum Dew Point 17.1 °C 16:29 15.6 °C 17.9 °C, 2013 10.1 °C, 2011
Mean Dew Point 15.2 °C 13.8 °C 15.6 °C, 2015 7.8 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.4 °C 00:20 14.2 °C 20.9 °C, 2022 11.8 °C, 2016
Day Maximum (09-21) 22.6 °C 15:07 21.4 °C 30.3 °C, 2013 17.2 °C, 2011
Max 10m Temp Rise 0.7 °C 11:31 0.6 °C 0.7 °C, 2013 0.3 °C, 2015
Max 1hr Temp Rise 2.1 °C 11:40 2.2 °C 3.5 °C, 2013 1.0 °C, 2015
Max 1hr Hum Rise 5% 16:29 10% 28%, 2018 4%, 2015
Max 10m Temp Fall 0.5 °C 17:31 0.6 °C 1.3 °C, 2016 0.1 °C, 2015
Max 1hr Temp Fall 1.4 °C 21:17 2.0 °C 3.9 °C, 2018 0.5 °C, 2015
Max 1hr Hum Fall 9% 12:10 10% 18%, 2012 6%, 2024
Max 10m Wind Speed 6.1 mph 16:30 7.6 mph 13.6 mph, 2016 5.7 mph, 2013
Minimum Feels-like 19.0 °C 00:07 16.6 °C 23.0 °C, 2022 12.6 °C, 2017
Maximum Feels-like 27.8 °C 14:40 25.5 °C 34.4 °C, 2013 17.3 °C, 2011
Mean Feels-like 22.4 °C 20.7 °C 28.5 °C, 2022 15.1 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.2 °C (-1.7) 7.3 °C (-1.7) 15.6 °C (+6.7), 2013 3.6 °C (-5.3), 2015
Humidity Range 28% 28% 53%, 2020 13%, 2015
Pressure Range 5 hPa 6 hPa 8 hPa, 2020 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [27%]37 hrs (44%) [19%] 12 [81%], 2013 0 [0%], 2015
Wet Hours 026 hrs (182%) [8.3%] 5, 2015 0, 2011
Cloud Cover am: Mostly Cloudy
pm: Partly Cloudy
Events None
Comments -
Extra Comments
Issues rain gauge blocked - still reporting rain from days ago
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 21.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th 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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose