Daily Report for 27th October 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.7 °C (-0.7) 03:12 8.6 °C (-0.1) 14.1 °C (+6.7), 2021 1.8 °C (-5.6), 2012
Maximum Temperature 13.5 °C (+0.3) 15:42 14.0 °C (-0.8) 19.8 °C (+6.6), 2022 6.6 °C (-6.6), 2018
Mean Temperature 9.4 °C (-0.2) 11.2 °C (-0.4) 16.2 °C, 2022 4.3 °C, 2012
Minimum Humidity 79% 18:21 75% 81%, 2011 56%, 2013
Maximum Humidity 94% 14:40 94% 98%, 2023 88%, 2016
Mean Humidity 90% 87% 91%, 2023 72%, 2025
Minimum Pressure 994 hPa 15:24 1005 hPa 1030 hPa, 2016 990 hPa, 2013
Maximum Pressure 1003 hPa 23:42 1012 hPa 1035 hPa, 2017 992 hPa, 2023
Mean Pressure 999 hPa 1009 hPa 1032 hPa, 2017 991 hPa, 2023
Mean Wind Speed 4.2 mph (+0.1) 3.6 mph (-0.5) 9.0 mph, 2021 2.2 mph, 2019
Maximum Wind Speed 12.3 mph 12:27 13.2 mph 20.6 mph, 2013 7.7 mph, 2017
Maximum Gust 26.5 mph 15:46 21.4 mph 33.9 mph, 2013 11.2 mph, 2009
Mean Wind Direction SSW
Rainfall 2.5 mm 153.3 mm (271%) 8.9 mm, 2013
Maximum Hourly Rain 0.7 mm 13:23 3.3 mm, 2013
Maximum 10-min Rain 0.3 mm 13:23 1.2 mm, 2013
Maximum Rain Rate 18 mm/h 13:23 18 mm/h, 2020
Minimum Dew Point 5.4 °C 02:11 6.7 °C 11.5 °C, 2022 -1.3 °C, 2012
Maximum Dew Point 12.6 °C 15:42 11.1 °C 16.3 °C, 2022 2.6 °C, 2012
Mean Dew Point 7.9 °C 9.0 °C 14.3 °C, 2022 0.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.7 °C 03:16 9.0 °C 14.1 °C, 2021 1.8 °C, 2012
Day Maximum (09-21) 13.5 °C 15:42 14.0 °C 19.8 °C, 2022 6.6 °C, 2018
Max 10m Temp Rise 0.4 °C 12:55 0.4 °C 0.8 °C, 2009 0.2 °C, 2011
Max 1hr Temp Rise 1.0 °C 08:21 1.5 °C 2.2 °C, 2009 0.8 °C, 2011
Max 1hr Hum Rise 4% 19:23 6% 11%, 2013 3%, 2015
Max 10m Temp Fall 0.3 °C 15:52 0.4 °C 1.0 °C, 2009 0.2 °C, 2014
Max 1hr Temp Fall 1.2 °C 18:42 1.2 °C 2.6 °C, 2009 0.7 °C, 2025
Max 1hr Hum Fall 7% 16:43 7% 14%, 2024 3%, 2018
Max 10m Wind Speed 7.2 mph 12:55 8.8 mph 15.3 mph, 2013 5.1 mph, 2009
Minimum Feels-like 4.3 °C 00:27 7.1 °C 16.2 °C, 2021 -5.1 °C, 2012
Maximum Feels-like 16.1 °C 15:42 15.6 °C 24.5 °C, 2022 5.8 °C, 2012
Mean Feels-like 9.9 °C 11.8 °C 19.8 °C, 2022 0.7 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.8 °C (+1.0) 5.4 °C (-0.7) 7.2 °C (+1.4), 2022 2.6 °C (-3.2), 2011
Humidity Range 15% 19% 38%, 2013 11%, 2011
Pressure Range 9 hPa 7 hPa 10 hPa, 2012 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]66 hrs (64%) [25%] 9.4 [106%], 2017 0 [0%], 2011
Wet Hours 6
[Mean rain rate: 0.4 mm/h]		119 hrs (279%) [18%] 6, 2020 0, 2010
Cloud Cover Overcast
Events None
Comments day Light Rain
Extra Comments
Issues wind sensor not reporting properly - v low speeds
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 10.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 27th 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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Wind rose