Daily Report for 4th August 2010

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.1 °C (-1.4) 23:59 14.0 °C (-0.5) 18.9 °C (+4.4), 2018 10.9 °C (-3.6), 2020
Maximum Temperature 19.8 °C (-3.4) 14:05 21.5 °C (-1.8) 28.5 °C (+5.3), 2018 19.4 °C (-3.8), 2023
Mean Temperature 16.4 °C (-2.4) 17.8 °C (-1.1) 23.5 °C, 2018 16.4 °C, 2010
Minimum Humidity 66% 12:04 52% 71%, 2023 36%, 2014
Maximum Humidity 86% 21:31 81% 96%, 2020 75%, 2014
Mean Humidity 77% 67% 83%, 2009 54%, 2014
Minimum Pressure 1004 hPa 14:02 1011 hPa 1022 hPa, 2018 1004 hPa, 2010
Maximum Pressure 1011 hPa 00:35 1015 hPa 1026 hPa, 2018 1011 hPa, 2010
Mean Pressure 1008 hPa 1013 hPa 1024 hPa, 2018 1008 hPa, 2010
Mean Wind Speed 4.9 mph (+0.9) 3.7 mph (-0.3) 9.7 mph, 2016 1.2 mph, 2021
Maximum Wind Speed 13.8 mph 10.6 mph 23.2 mph, 2016 6.4 mph, 2021
Maximum Gust 21.9 mph 13:20 15.6 mph 33.9 mph, 2016 11.4 mph, 2021
Mean Wind Direction W
Rainfall 8.2 mm 8.2 mm (118%) 11.6 mm, 2011
Maximum Hourly Rain 4.4 mm 19:20 4.4 mm, 2010
Maximum 10-min Rain 2.2 mm 19:20 2.2 mm, 2010
Maximum Rain Rate 50 mm/h 19:17 50 mm/h, 2010
Minimum Dew Point 9.7 °C 23:59 9.6 °C 12.7 °C, 2019 6.8 °C, 2014
Maximum Dew Point 14.7 °C 13:15 13.7 °C 18.1 °C, 2011 12.0 °C, 2017
Mean Dew Point 12.3 °C 11.4 °C 15.6 °C, 2018 9.1 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 15.1 °C * 14.5 °C 18.9 °C, 2018 10.9 °C, 2020
Day Maximum (09-21) 19.8 °C 21.5 °C 28.5 °C, 2018 19.4 °C, 2023
Max 10m Temp Rise 0.5 °C 11:18 0.7 °C 1.0 °C, 2020 0.3 °C, 2009
Max 1hr Temp Rise 2.0 °C 11:35 2.3 °C 4.8 °C, 2020 0.7 °C, 2009
Max 1hr Hum Rise 11% 12:57 8% 27%, 2018 5%, 2009
Max 10m Temp Fall 1.0 °C 14:43 0.7 °C 1.0 °C, 2010 0.2 °C, 2009
Max 1hr Temp Fall 3.4 °C 15:14 1.8 °C 3.9 °C, 2018 0.6 °C, 2009
Max 1hr Hum Fall 9% 01:57 11% 23%, 2020 3%, 2009
Max 10m Wind Speed 10.4 mph 13:09 8.1 mph 16.8 mph, 2016 5.3 mph, 2021
Minimum Feels-like 14.1 °C 23:59 15.2 °C 23.6 °C, 2018 12.0 °C, 2020
Maximum Feels-like 23.5 °C 13:56 24.0 °C 32.0 °C, 2018 21.6 °C, 2015
Mean Feels-like 18.8 °C 19.8 °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 6.7 °C (-2.0) 7.5 °C (-1.2) 12.3 °C (+3.6), 2020 3.6 °C (-5.1), 2011
Humidity Range 20% 29% 56%, 2020 20%, 2010
Pressure Range 7 hPa 4 hPa 7 hPa, 2010 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [14%]9.5 hrs (38%) [17%] 13 [93%], 2018 0.1 [1%], 2009
Wet Hours 3
[Mean rain rate: 2.7 mm/h]		3 hrs (61%) [3.1%] 6, 2011 0, 2013
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments 1230 Heavy, 1430 Very Heavy, 19 Very Heavy, 20 Moderate Showers
Extra Comments
Issues Rain figures are estimates due to softwafre glitches
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 4th August 2010.
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