Daily Report for 14th July 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.1 °C (-0.2) 03:51 14.1 °C (+0.3) 17.6 °C (+3.3), 2025 11.7 °C (-2.6), 2011
Maximum Temperature 24.6 °C (+1.5) 17:40 21.7 °C (-1.2) 28.2 °C (+5.1), 2013 16.9 °C (-6.2), 2012
Mean Temperature 19.0 °C (+0.6) 17.6 °C (-0.4) 23.2 °C, 2013 14.6 °C, 2012
Minimum Humidity 61% 17:31 64% 73%, 2023 34%, 2011
Maximum Humidity 91% 04:01 92% 95%, 2018 72%, 2011
Mean Humidity 77% 80% 88%, 2012 56%, 2011
Minimum Pressure 1018 hPa 03:29 1012 hPa 1023 hPa, 2019 999 hPa, 2012
Maximum Pressure 1021 hPa 23:42 1017 hPa 1026 hPa, 2022 1007 hPa, 2010
Mean Pressure 1019 hPa 1014 hPa 1024 hPa, 2019 1004 hPa, 2010
Mean Wind Speed 4.0 mph (-0.3) 3.1 mph (-1.2) 7.9 mph, 2025 1.4 mph, 2024
Maximum Wind Speed 11.1 mph 12:42 10.7 mph 18.2 mph, 2025 7.8 mph, 2013
Maximum Gust 17.1 mph 17:08 15.5 mph 27.0 mph, 2009 10.2 mph, 2013
Mean Wind Direction NNW
Rainfall 0.0 mm 60.0 mm (289%) 7.2 mm, 2023
Maximum Hourly Rain 0.0 mm 21:04 2.9 mm, 2019
Maximum 10-min Rain n/a 18:46 2, 2012
Maximum Rain Rate n/a 20:14 30, 2012
Minimum Dew Point 12.4 °C 03:03 11.9 °C 14.3 °C, 2015 5.3 °C, 2011
Maximum Dew Point 17.4 °C 14:17 15.7 °C 17.5 °C, 2023 10.0 °C, 2011
Mean Dew Point 14.8 °C 13.9 °C 15.2 °C, 2015 7.5 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.1 °C 03:50 14.2 °C 18.7 °C, 2025 11.7 °C, 2011
Day Maximum (09-21) 24.6 °C 17:41 21.7 °C 28.2 °C, 2013 15.7 °C, 2012
Max 10m Temp Rise 0.7 °C 14:24 0.6 °C 0.7 °C, 2014 0.3 °C, 2023
Max 1hr Temp Rise 1.8 °C 11:37 2.1 °C 2.9 °C, 2018 1.0 °C, 2023
Max 1hr Hum Rise 5% 01:01 10% 13%, 2023 5%, 2020
Max 10m Temp Fall 0.5 °C 18:02 0.6 °C 0.7 °C, 2016 0.4 °C, 2014
Max 1hr Temp Fall 1.7 °C 18:45 2.0 °C 2.8 °C, 2016 1.1 °C, 2023
Max 1hr Hum Fall 7% 11:41 10% 13%, 2018 7%, 2015
Max 10m Wind Speed 7.6 mph 15:32 7.6 mph 13.9 mph, 2025 5.4 mph, 2013
Minimum Feels-like 16.6 °C 03:47 16.6 °C 20.4 °C, 2015 11.7 °C, 2011
Maximum Feels-like 30.1 °C 17:46 25.8 °C 31.2 °C, 2013 19.6 °C, 2012
Mean Feels-like 22.9 °C 20.9 °C 26.3 °C, 2013 16.8 °C, 2016
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.5 °C (+1.7) 7.6 °C (-1.5) 13.0 °C (+4.1), 2018 3.1 °C (-5.7), 2023
Humidity Range 30% 28% 53%, 2018 21%, 2015
Pressure Range 4 hPa 5 hPa 16 hPa, 2023 1 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [41%]43 hrs (48%) [20%] 12 [81%], 2022 0 [0%], 2023
Wet Hours 026 hrs (169%) [7.7%] 8, 2012 0, 2011
Cloud Cover am: Mostly Cloudy
pm: Partly Cloudy transitioned to Mostly Sunny
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 14th 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