Daily Report for 30th October 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.1 °C (+7.0) 23:41 8.7 °C (+0.2) 14.1 °C (+7.0), 2020 3.1 °C (-4.0), 2017
Maximum Temperature 15.9 °C (+3.1) 13:32 14.1 °C (-0.6) 17.8 °C (+5.0), 2014 8.6 °C (-4.2), 2018
Mean Temperature 14.9 °C (+5.0) 11.3 °C (-0.2) 15.2 °C, 2014 6.3 °C, 2017
Minimum Humidity 85% 08:33 75% 86%, 2014 62%, 2012
Maximum Humidity 94% 22:19 93% 98%, 2009 81%, 2016
Mean Humidity 89% 87% 92%, 2014 79%, 2019
Minimum Pressure 1014 hPa 00:00 1005 hPa 1030 hPa, 2016 993 hPa, 2021
Maximum Pressure 1021 hPa 21:32 1013 hPa 1033 hPa, 2016 999 hPa, 2010
Mean Pressure 1017 hPa 1009 hPa 1031 hPa, 2016 996 hPa, 2023
Mean Wind Speed 3.4 mph (-0.7) 3.7 mph (-0.4) 6.3 mph, 2011 0.6 mph, 2016
Maximum Wind Speed 7.7 mph 04:10 13.1 mph 16.3 mph, 2021 4.4 mph, 2024
Maximum Gust 24.2 mph 00:36 22.0 mph 24.2 mph, 2019 6.9 mph, 2024
Mean Wind Direction SW
Rainfall 1.3 mm 159.2 mm (253%) 2.9 mm, 2021
Maximum Hourly Rain 0.9 mm 18:37 2.4 mm, 2021
Maximum 10-min Rain 0.4 mm 18:03 1.2 mm, 2021
Maximum Rain Rate 1.7 mm/h 18:03 36 mm/h, 2012
Minimum Dew Point 12.2 °C 00:19 6.9 °C 12.5 °C, 2014 1.3 °C, 2017
Maximum Dew Point 14.1 °C 14:04 11.1 °C 16.0 °C, 2014 5.5 °C, 2018
Mean Dew Point 13.1 °C 9.1 °C 14.0 °C, 2014 3.4 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 14.2 °C * 22:57 9.1 °C 14.3 °C, 2022 3.1 °C, 2017
Day Maximum (09-21) 15.9 °C 12:43 14.0 °C 17.8 °C, 2014 8.6 °C, 2018
Max 10m Temp Rise 0.2 °C 11:19 0.4 °C 0.7 °C, 2025 0.2 °C, 2014
Max 1hr Temp Rise 0.5 °C 11:40 1.4 °C 2.4 °C, 2013 0.5 °C, 2020
Max 1hr Hum Rise 4% 14:29 6% 10%, 2017 2%, 2016
Max 10m Temp Fall 0.2 °C 14:09 0.4 °C 0.6 °C, 2009 0.1 °C, 2016
Max 1hr Temp Fall 0.5 °C 14:26 1.2 °C 2.3 °C, 2017 0.5 °C, 2016
Max 1hr Hum Fall 2% 07:47 7% 14%, 2012 1%, 2016
Max 10m Wind Speed 2.8 mph 04:14 8.4 mph 12.7 mph, 2021 2.8 mph, 2020
Minimum Feels-like 16.7 °C 00:00 7.3 °C 16.7 °C, 2020 -0.5 °C, 2018
Maximum Feels-like 19.2 °C 12:04 15.7 °C 22.4 °C, 2014 7.9 °C, 2018
Mean Feels-like 17.7 °C 12.0 °C 18.6 °C, 2014 3.8 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 1.8 °C (-3.9) 5.3 °C (-0.8) 8.9 °C (+3.2), 2013 1.8 °C (-3.9), 2020
Humidity Range 9% 18% 36%, 2012 3%, 2016
Pressure Range 7 hPa 7 hPa 11 hPa, 2018 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]69 hrs (60%) [24%] 8.4 [97%], 2017 0 [0%], 2016
Wet Hours 2
[Mean rain rate: 0.7 mm/h]		127 hrs (267%) [18%] 4, 2015 0, 2011
Cloud Cover Overcast
Events None
Comments eve rn
Extra Comments
Issues wind sensor not reporting properly - v low speeds
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 9.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 30th 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