Daily Report for 31st October 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.5 °C (+3.5) 21:17 8.8 °C (+0.3) 13.4 °C (+6.4), 2014 -0.8 °C (-7.8), 2018
Maximum Temperature 15.5 °C (+2.9) 10:28 14.1 °C (-0.5) 21.3 °C (+8.7), 2014 10.9 °C (-1.7), 2019
Mean Temperature 13.0 °C (+3.2) 11.4 °C (-0.1) 16.7 °C, 2014 6.8 °C, 2018
Minimum Humidity 77% 16:31 75% 85%, 2010 54%, 2014
Maximum Humidity 94% 14:02 93% 98%, 2009 81%, 2016
Mean Humidity 86% 87% 94%, 2009 77%, 2012
Minimum Pressure 1006 hPa 13:36 1005 hPa 1024 hPa, 2016 978 hPa, 2012
Maximum Pressure 1020 hPa 00:01 1013 hPa 1030 hPa, 2017 999 hPa, 2012
Mean Pressure 1012 hPa 1009 hPa 1028 hPa, 2016 989 hPa, 2012
Mean Wind Speed 5.7 mph (+1.6) 3.8 mph (-0.3) 9.6 mph, 2021 0.5 mph, 2016
Maximum Wind Speed 10.8 mph 09:57 13.0 mph 22.4 mph, 2021 6.5 mph, 2016
Maximum Gust 28.8 mph 09:24 22.2 mph 36.5 mph, 2021 8.5 mph, 2015
Mean Wind Direction SSW
Rainfall 6.6 mm 165.8 mm (255%) 7.2 mm, 2021
Maximum Hourly Rain 2.9 mm 11:56 3.8 mm, 2021
Maximum 10-min Rain 1.1 mm 11:43 1.2 mm, 2021
Maximum Rain Rate 18 mm/h 11:39 18 mm/h, 2020
Minimum Dew Point 7.2 °C 23:46 6.9 °C 11.0 °C, 2014 -2.0 °C, 2018
Maximum Dew Point 13.4 °C 14:22 11.2 °C 16.8 °C, 2009 7.4 °C, 2019
Mean Dew Point 10.7 °C 9.2 °C 13.1 °C, 2014 3.6 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.4 °C * 04:29 9.2 °C 15.2 °C, 2011 -0.8 °C, 2018
Day Maximum (09-21) 15.5 °C 10:28 14.1 °C 21.3 °C, 2014 10.9 °C, 2019
Max 10m Temp Rise 0.4 °C 10:14 0.4 °C 1.1 °C, 2016 0.2 °C, 2010
Max 1hr Temp Rise 1.0 °C 10:18 1.4 °C 4.5 °C, 2018 0.4 °C, 2013
Max 1hr Hum Rise 8% 11:40 6% 10%, 2021 3%, 2010
Max 10m Temp Fall 0.6 °C 14:49 0.5 °C 1.0 °C, 2021 0.2 °C, 2010
Max 1hr Temp Fall 1.6 °C 15:31 1.2 °C 2.4 °C, 2016 0.6 °C, 2012
Max 1hr Hum Fall 11% 15:36 7% 15%, 2009 3%, 2010
Max 10m Wind Speed 5.2 mph 10:01 8.3 mph 17.5 mph, 2021 4.2 mph, 2016
Minimum Feels-like 10.7 °C 22:16 7.4 °C 16.0 °C, 2014 -0.8 °C, 2018
Maximum Feels-like 18.2 °C 10:28 15.8 °C 25.0 °C, 2014 11.0 °C, 2019
Mean Feels-like 14.6 °C 12.0 °C 19.6 °C, 2014 6.5 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 3 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.0 °C (-0.6) 5.3 °C (-0.8) 13.3 °C (+7.7), 2018 1.6 °C (-4.0), 2013
Humidity Range 17% 18% 42%, 2014 10%, 2016
Pressure Range 13 hPa 8 hPa 21 hPa, 2012 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.4 [16%]70 hrs (60%) [24%] 8 [92%], 2018 0 [0%], 2013
Wet Hours 5
[Mean rain rate: 1.3 mm/h]		132 hrs (268%) [18%] 5, 2020 0, 2011
Cloud Cover Overcast with periods of Mostly Sunny
Events None
Comments day rn
Extra Comments
Issues wind sensor not reporting properly - v low speeds
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 9.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 31st October 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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