Daily Report for 9th July 2024

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.3 °C (+0.4) 00:05 12.2 °C (-1.4) 17.6 °C (+3.7), 2017 10.9 °C (-3.0), 2009
Maximum Temperature 18.7 °C (-4.3) 17:33 19.1 °C (-3.7) 31.7 °C (+8.7), 2010 18.0 °C (-5.0), 2009
Mean Temperature 17.0 °C (-2.0) 15.6 °C (-2.5) 23.3 °C, 2010 14.7 °C, 2009
Minimum Humidity 89% 10:52 66% 89%, 2024 30%, 2013
Maximum Humidity 96% 03:30 92% 96%, 2024 67%, 2015
Mean Humidity 94% 81% 94%, 2024 48%, 2015
Minimum Pressure 1011 hPa 19:28 1009 hPa 1030 hPa, 2022 1007 hPa, 2011
Maximum Pressure 1015 hPa 00:03 1015 hPa 1032 hPa, 2022 1012 hPa, 2012
Mean Pressure 1012 hPa 1012 hPa 1031 hPa, 2022 1011 hPa, 2012
Mean Wind Speed 4.2 mph (-0.1) 3.7 mph (-0.6) 10.6 mph, 2016 0.6 mph, 2021
Maximum Wind Speed 12.8 mph 17:46 11.5 mph 22.6 mph, 2016 8.7 mph, 2022
Maximum Gust 17.6 mph 11:55 17.3 mph 37.1 mph, 2016 12.5 mph, 2012
Mean Wind Direction S
Rainfall 12.5 mm 80.1 mm (600%) 12.5 mm, 2024
Maximum Hourly Rain 3.1 mm 01:32 3.1 mm, 2024
Maximum 10-min Rain 1.2 mm 15:22 1.2 mm, 2024
Maximum Rain Rate 14 mm/h 02:23 18 mm/h, 2020
Minimum Dew Point 13.3 °C 00:02 9.4 °C 13.4 °C, 2020 3.6 °C, 2015
Maximum Dew Point 17.8 °C 16:57 14.9 °C 17.8 °C, 2024 7.8 °C, 2015
Mean Dew Point 15.9 °C 12.2 °C 15.9 °C, 2024 5.2 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.3 °C 00:06 12.4 °C 17.6 °C, 2017 10.9 °C, 2009
Day Maximum (09-21) 18.7 °C 17:27 19.1 °C 31.7 °C, 2010 18.0 °C, 2009
Max 10m Temp Rise 0.3 °C 08:01 0.6 °C 0.8 °C, 2018 0.3 °C, 2020
Max 1hr Temp Rise 1.2 °C 08:53 2.2 °C 3.7 °C, 2018 1.0 °C, 2020
Max 1hr Hum Rise 4% 12:25 11% 24%, 2022 4%, 2014
Max 10m Temp Fall 0.3 °C 18:02 0.8 °C 1.3 °C, 2018 0.3 °C, 2017
Max 1hr Temp Fall 0.9 °C 19:23 2.1 °C 4.4 °C, 2022 0.9 °C, 2016
Max 1hr Hum Fall 4% 17:32 11% 21%, 2018 4%, 2020
Max 10m Wind Speed 9.2 mph 17:54 8.4 mph 18.9 mph, 2016 6.3 mph, 2022
Minimum Feels-like 17.3 °C 00:02 13.7 °C 21.2 °C, 2023 11.1 °C, 2015
Maximum Feels-like 24.5 °C 17:03 22.4 °C 34.5 °C, 2010 21.3 °C, 2012
Mean Feels-like 21.5 °C 18.1 °C 26.1 °C, 2010 17.0 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.4 °C (-4.7) 6.8 °C (-2.2) 15.5 °C (+6.4), 2010 3.3 °C (-5.8), 2012
Humidity Range 7% 26% 58%, 2014 7%, 2024
Pressure Range 5 hPa 6 hPa 11 hPa, 2017 1 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]28 hrs (48%) [21%] 14.9 [100%], 2013 0 [0%], 2012
Wet Hours 9
[Mean rain rate: 1.4 mm/h]
41 hrs (415%) [19%] 9, 2024 0, 2009
Cloud Cover Overcast
Events None
Comments rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 18.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 9th July 2024.
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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