Daily Report for 29th September 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.7 °C (+2.5) 20:28 11.3 °C (-0.1) 14.0 °C (+3.8), 2011 4.4 °C (-5.8), 2024
Maximum Temperature 17.6 °C (+0.7) 15:12 20.5 °C (+1.6) 26.9 °C (+10.0), 2011 14.6 °C (-2.3), 2024
Mean Temperature 15.2 °C (+1.6) 15.8 °C (+0.7) 19.6 °C, 2011 9.8 °C, 2024
Minimum Humidity 67% 17:50 56% 83%, 2014 42%, 2011
Maximum Humidity 95% 07:20 90% 96%, 2010 84%, 2016
Mean Humidity 87% 76% 90%, 2019 70%, 2016
Minimum Pressure 1015 hPa 05:27 1016 hPa 1032 hPa, 2015 993 hPa, 2019
Maximum Pressure 1017 hPa 10:51 1021 hPa 1036 hPa, 2015 1008 hPa, 2013
Mean Pressure 1016 hPa 1018 hPa 1034 hPa, 2015 998 hPa, 2019
Mean Wind Speed 1.2 mph (-2.7) 3.0 mph (-0.9) 11.4 mph, 2016 0.9 mph, 2018
Maximum Wind Speed 8.5 mph 11:16 11.6 mph 22.7 mph, 2016 7.2 mph, 2018
Maximum Gust 11.5 mph 11:16 19.6 mph 40.3 mph, 2016 10.3 mph, 2018
Mean Wind Direction W
Rainfall 5.1 mm 19.4 mm (40%) 11.7 mm, 2010
Maximum Hourly Rain 1.1 mm 07:17 3.5 mm, 2010
Maximum 10-min Rain 0.5 mm 09:05 1.8 mm, 2017
Maximum Rain Rate 18 mm/h 05:59 26 mm/h, 2017
Minimum Dew Point 10.6 °C 17:50 8.6 °C 11.5 °C, 2014 2.7 °C, 2012
Maximum Dew Point 14.7 °C 07:56 13.5 °C 17.4 °C, 2011 8.2 °C, 2018
Mean Dew Point 13.0 °C 11.3 °C 14.1 °C, 2017 6.0 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 14.3 °C * 21:16 11.7 °C 16.8 °C, 2016 4.4 °C, 2024
Day Maximum (09-21) 17.6 °C 15:42 20.5 °C 26.9 °C, 2011 14.6 °C, 2024
Max 10m Temp Rise 0.4 °C 12:06 0.6 °C 0.9 °C, 2018 0.3 °C, 2010
Max 1hr Temp Rise 1.0 °C 12:12 2.3 °C 3.7 °C, 2011 0.8 °C, 2019
Max 1hr Hum Rise 12% 18:50 10% 13%, 2018 3%, 2013
Max 10m Temp Fall 0.5 °C 18:38 0.5 °C 1.0 °C, 2017 0.2 °C, 2014
Max 1hr Temp Fall 2.6 °C 19:29 2.0 °C 3.4 °C, 2018 0.9 °C, 2014
Max 1hr Hum Fall 8% 13:02 11% 18%, 2012 6%, 2019
Max 10m Wind Speed 4.6 mph 11:48 7.9 mph 17.4 mph, 2016 4.6 mph, 2020
Minimum Feels-like 14.4 °C 20:17 11.8 °C 16.1 °C, 2011 3.5 °C, 2022
Maximum Feels-like 20.6 °C 15:12 23.2 °C 30.0 °C, 2011 15.2 °C, 2012
Mean Feels-like 18.1 °C 17.8 °C 22.8 °C, 2011 10.2 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.9 °C (-1.8) 9.2 °C (+1.8) 12.9 °C (+6.2), 2011 4.1 °C (-2.6), 2013
Humidity Range 28% 34% 54%, 2011 13%, 2014
Pressure Range 2 hPa 5 hPa 19 hPa, 2024 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [38%]180 hrs (127%) [54%] 10.61 [100%], 2011 0 [0%], 2024
Wet Hours 8
[Mean rain rate: 0.6 mm/h]
21 hrs (53%) [3%] 10, 2010 0, 2009
Cloud Cover am: Overcast
pm: Partly Cloudy
Events None
Comments 01-10 rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 13.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 29th September 2020.
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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