Daily Report for 5th September 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.9 °C (-1.6) 06:50 12.0 °C (-0.7) 16.1 °C (+3.6), 2022 7.7 °C (-4.8), 2015
Maximum Temperature 17.9 °C (-3.0) 14:11 20.1 °C (-0.9) 28.7 °C (+7.8), 2023 14.8 °C (-6.1), 2015
Mean Temperature 14.2 °C (-2.3) 16.0 °C (-0.8) 21.5 °C, 2023 11.9 °C, 2015
Minimum Humidity 41% 15:00 46% 85%, 2024 40%, 2013
Maximum Humidity 82% 06:00 84% 97%, 2013 77%, 2012
Mean Humidity 66% 68% 92%, 2024 58%, 2012
Minimum Pressure 1018 hPa 00:00 1018 hPa 1024 hPa, 2012 1008 hPa, 2011
Maximum Pressure 1028 hPa 20:30 1024 hPa 1030 hPa, 2012 1015 hPa, 2011
Mean Pressure 1025 hPa 1021 hPa 1027 hPa, 2012 1011 hPa, 2013
Mean Wind Speed 4.0 mph (+0.1) 5.5 mph (+1.6) 8.0 mph, 2011 1.4 mph, 2021
Maximum Wind Speed 12.8 mph 14:10 14.2 mph 20.7 mph, 2011 6.7 mph, 2014
Maximum Gust 19.6 mph 15:37 23.0 mph 29.9 mph, 2011 8.7 mph, 2014
Mean Wind Direction NW
Rainfall 0.0 mm 5.9 mm (71%) 7.2 mm, 2022
Maximum Hourly Rain n/a 5, 2022
Maximum 10-min Rain n/a 3.1, 2024
Maximum Rain Rate n/a 48, 2024
Minimum Dew Point 4.1 °C 15:00 6.3 °C 14.1 °C, 2022 4.1 °C, 2019
Maximum Dew Point 9.8 °C 00:19 12.5 °C 19.8 °C, 2016 8.7 °C, 2012
Mean Dew Point 7.6 °C 9.8 °C 16.4 °C, 2016 7.0 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.9 °C 06:50 12.1 °C 16.1 °C, 2022 9.3 °C, 2015
Day Maximum (09-21) 17.9 °C 14:12 20.1 °C 28.7 °C, 2023 14.8 °C, 2015
Max 10m Temp Rise 0.7 °C 09:48 0.7 °C 1.3 °C, 2009 0.4 °C, 2014
Max 1hr Temp Rise 1.8 °C 11:45 2.2 °C 3.7 °C, 2013 1.0 °C, 2015
Max 1hr Hum Rise 8% 16:34 8% 15%, 2011 6%, 2012
Max 10m Temp Fall 0.5 °C 21:10 0.6 °C 1.2 °C, 2009 0.3 °C, 2010
Max 1hr Temp Fall 1.7 °C 21:26 1.5 °C 2.3 °C, 2013 0.8 °C, 2010
Max 1hr Hum Fall 15% 11:44 13% 17%, 2013 5%, 2016
Max 10m Wind Speed 8.0 mph 16:45 10.2 mph 13.3 mph, 2011 4.3 mph, 2021
Minimum Feels-like 11.0 °C 07:29 12.3 °C 19.9 °C, 2022 7.7 °C, 2015
Maximum Feels-like 18.1 °C 16:39 21.7 °C 35.2 °C, 2023 16.3 °C, 2015
Mean Feels-like 14.6 °C 17.3 °C 26.3 °C, 2023 12.6 °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 7.0 °C (-1.4) 8.2 °C (-0.2) 13.4 °C (+5.0), 2023 6.0 °C (-2.4), 2010
Humidity Range 41% 38% 57%, 2013 12%, 2024
Pressure Range 10 hPa 6 hPa 11 hPa, 2015 2 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [66%]32 hrs (122%) [53%] 12 [99%], 2012 0 [0%], 2016
Wet Hours 05 hrs (73%) [4.2%] 7, 2016 0, 2009
Cloud Cover Partly Cloudy with periods of Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 19.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 5th September 2019.
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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