Daily Report for 9th November 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.5 °C (+5.4) 07:32 6.2 °C (-0.2) 11.5 °C (+5.4), 2020 1.4 °C (-4.7), 2017
Maximum Temperature 16.6 °C (+5.6) 13:46 13.2 °C (+1.7) 16.6 °C (+5.6), 2020 6.9 °C (-4.1), 2013
Mean Temperature 13.5 °C (+5.5) 9.8 °C (+0.7) 13.5 °C, 2020 4.6 °C, 2009
Minimum Humidity 84% 15:32 76% 95%, 2013 69%, 2012
Maximum Humidity 96% 08:54 94% 98%, 2009 78%, 2012
Mean Humidity 92% 87% 97%, 2013 75%, 2012
Minimum Pressure 1019 hPa 04:57 1017 hPa 1023 hPa, 2021 968 hPa, 2010
Maximum Pressure 1022 hPa 23:53 1027 hPa 1025 hPa, 2017 987 hPa, 2010
Mean Pressure 1020 hPa 1022 hPa 1024 hPa, 2021 978 hPa, 2010
Mean Wind Speed 1.2 mph (-3.4) 2.8 mph (-1.8) 9.0 mph, 2015 1.2 mph, 2020
Maximum Wind Speed 7.0 mph 16:06 8.4 mph 24.2 mph, 2016 5.8 mph, 2009
Maximum Gust 12.0 mph 16:07 16.4 mph 38.7 mph, 2016 8.1 mph, 2009
Mean Wind Direction S
Rainfall 2.3 mm 8.0 mm (40%) 20.8 mm, 2016
Maximum Hourly Rain 1.3 mm 18:20 5.1 mm, 2016
Maximum 10-min Rain 0.7 mm 16:57 1.7 mm, 2016
Maximum Rain Rate 18 mm/h 18:06 72 mm/h, 2022
Minimum Dew Point 10.6 °C 07:22 4.6 °C 10.6 °C, 2020 0.4 °C, 2017
Maximum Dew Point 14.1 °C 13:46 10.5 °C 14.1 °C, 2020 4.5 °C, 2016
Mean Dew Point 12.2 °C 7.7 °C 12.2 °C, 2020 3.1 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.5 °C 07:32 7.3 °C 11.5 °C, 2020 1.4 °C, 2017
Day Maximum (09-21) 16.6 °C 13:47 13.2 °C 16.6 °C, 2020 6.9 °C, 2013
Max 10m Temp Rise 0.4 °C 13:03 0.4 °C 1.0 °C, 2009 0.2 °C, 2010
Max 1hr Temp Rise 1.6 °C 13:03 1.7 °C 2.3 °C, 2018 0.7 °C, 2010
Max 1hr Hum Rise 5% 17:31 6% 14%, 2022 1%, 2013
Max 10m Temp Fall 0.2 °C 13:58 0.5 °C 2.7 °C, 2022 0.2 °C, 2010
Max 1hr Temp Fall 0.8 °C 02:15 1.4 °C 3.1 °C, 2022 0.6 °C, 2013
Max 1hr Hum Fall 5% 12:53 7% 14%, 2018 1%, 2013
Max 10m Wind Speed 0.1 mph 16:06 2.7 mph 20.2 mph, 2016 0.1 mph, 2020
Minimum Feels-like 13.1 °C 07:21 6.1 °C 13.1 °C, 2020 -2.2 °C, 2019
Maximum Feels-like 20.0 °C 13:45 15.0 °C 20.0 °C, 2020 6.7 °C, 2010
Mean Feels-like 15.9 °C 10.7 °C 15.9 °C, 2020 2.9 °C, 2019
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.1 °C (+0.1) 7.0 °C (+1.9) 11.3 °C (+6.3), 2017 2.9 °C (-2.1), 2012
Humidity Range 12% 19% 27%, 2014 3%, 2013
Pressure Range 3 hPa 10 hPa 20 hPa, 2018 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [24%]32 hrs (121%) [43%] 6 [73%], 2022 0 [0%], 2010
Wet Hours 2
[Mean rain rate: 1.1 mm/h]		11 hrs (56%) [4.9%] 10, 2016 0, 2009
Cloud Cover Partly Cloudy or Mostly Cloudy
Events None
Comments pm rn
Extra Comments
Issues wind sensor not reporting properly - v low speeds
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 10.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 9th November 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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Wind rose