Daily Report for 4th August 2024

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.2 °C (-1.3) 06:17 16.6 °C (+2.1) 18.9 °C (+4.4), 2018 10.9 °C (-3.6), 2020
Maximum Temperature 23.4 °C (+0.2) 16:46 26.1 °C (+2.9) 28.5 °C (+5.3), 2018 19.4 °C (-3.8), 2023
Mean Temperature 18.1 °C (-0.6) 20.7 °C (+2.5) 23.5 °C, 2018 16.4 °C, 2010
Minimum Humidity 54% 14:21 53% 71%, 2023 36%, 2014
Maximum Humidity 84% 07:14 90% 96%, 2020 75%, 2014
Mean Humidity 69% 74% 83%, 2009 54%, 2014
Minimum Pressure 1015 hPa 00:19 1013 hPa 1022 hPa, 2018 1004 hPa, 2010
Maximum Pressure 1018 hPa 10:29 1016 hPa 1026 hPa, 2018 1011 hPa, 2010
Mean Pressure 1016 hPa 1014 hPa 1024 hPa, 2018 1008 hPa, 2010
Mean Wind Speed 2.7 mph (-1.3) 2.1 mph (-1.9) 9.7 mph, 2016 1.2 mph, 2021
Maximum Wind Speed 8.8 mph 14:29 8.8 mph 23.2 mph, 2016 6.4 mph, 2021
Maximum Gust 13.5 mph 21:39 14.3 mph 33.9 mph, 2016 11.4 mph, 2021
Mean Wind Direction WSW
Rainfall 0.0 mm 2.4 mm (34%) 11.6 mm, 2011
Maximum Hourly Rain n/a 4.4, 2010
Maximum 10-min Rain n/a 2.2, 2010
Maximum Rain Rate n/a 50, 2010
Minimum Dew Point 9.6 °C 03:44 12.4 °C 12.7 °C, 2019 6.8 °C, 2014
Maximum Dew Point 14.7 °C 19:34 18.5 °C 18.1 °C, 2011 12.0 °C, 2017
Mean Dew Point 12.1 °C 15.6 °C 15.6 °C, 2018 9.1 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.2 °C 06:17 16.9 °C 18.9 °C, 2018 10.9 °C, 2020
Day Maximum (09-21) 23.4 °C 16:46 26.1 °C 28.5 °C, 2018 19.4 °C, 2023
Max 10m Temp Rise 0.6 °C 11:52 0.7 °C 1.0 °C, 2020 0.3 °C, 2009
Max 1hr Temp Rise 2.2 °C 12:15 2.6 °C 4.8 °C, 2020 0.7 °C, 2009
Max 1hr Hum Rise 9% 19:25 11% 27%, 2018 5%, 2009
Max 10m Temp Fall 0.4 °C 18:52 0.6 °C 1.0 °C, 2010 0.2 °C, 2009
Max 1hr Temp Fall 1.6 °C 19:23 2.4 °C 3.9 °C, 2018 0.6 °C, 2009
Max 1hr Hum Fall 9% 08:21 12% 23%, 2020 3%, 2009
Max 10m Wind Speed 6.7 mph 21:48 6.4 mph 16.8 mph, 2016 5.3 mph, 2021
Minimum Feels-like 14.5 °C 06:14 19.7 °C 23.6 °C, 2018 12.0 °C, 2020
Maximum Feels-like 26.8 °C 17:29 31.9 °C 32.0 °C, 2018 21.6 °C, 2015
Mean Feels-like 20.4 °C 25.1 °C 27.9 °C, 2018 18.8 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.2 °C (+1.5) 9.5 °C (+0.8) 12.3 °C (+3.6), 2020 3.6 °C (-5.1), 2011
Humidity Range 30% 37% 56%, 2020 20%, 2010
Pressure Range 3 hPa 3 hPa 7 hPa, 2010 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [29%]19 hrs (76%) [34%] 13 [94%], 2018 0.1 [1%], 2009
Wet Hours 01 hrs (20%) [1%] 6, 2011 0, 2013
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 22.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 4th August 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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