Daily Report for 25th October 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.4 °C (+0.8) 06:03 8.7 °C (-0.0) 13.0 °C (+5.3), 2013 1.4 °C (-6.2), 2010
Maximum Temperature 11.8 °C (-1.7) 14:53 14.1 °C (-0.9) 18.3 °C (+4.8), 2013 9.4 °C (-4.1), 2010
Mean Temperature 9.9 °C (-0.5) 11.4 °C (-0.5) 15.5 °C, 2013 5.0 °C, 2010
Minimum Humidity 79% 15:07 74% 92%, 2024 56%, 2010
Maximum Humidity 92% 01:18 94% 98%, 2012 84%, 2016
Mean Humidity 87% 87% 94%, 2024 76%, 2010
Minimum Pressure 996 hPa 01:01 1006 hPa 1024 hPa, 2010 992 hPa, 2011
Maximum Pressure 998 hPa 08:12 1013 hPa 1030 hPa, 2010 998 hPa, 2020
Mean Pressure 997 hPa 1009 hPa 1027 hPa, 2010 996 hPa, 2011
Mean Wind Speed 3.2 mph (-0.9) 3.6 mph (-0.5) 7.6 mph, 2009 0.4 mph, 2016
Maximum Wind Speed 12.1 mph 14:51 13.3 mph 22.6 mph, 2019 5.3 mph, 2016
Maximum Gust 19.6 mph 04:42 21.3 mph 36.9 mph, 2019 8.5 mph, 2015
Mean Wind Direction SSW
Rainfall 2.1 mm 150.0 mm (286%) 2.1 mm, 2020
Maximum Hourly Rain 0.7 mm 01:01 1.7 mm, 2011
Maximum 10-min Rain 0.5 mm 01:10 1.4 mm, 2011
Maximum Rain Rate 18 mm/h 01:02 20 mm/h, 2011
Minimum Dew Point 6.7 °C 23:42 6.8 °C 11.6 °C, 2013 -0.8 °C, 2010
Maximum Dew Point 9.9 °C 01:02 11.1 °C 16.4 °C, 2013 4.0 °C, 2010
Mean Dew Point 7.8 °C 9.1 °C 13.1 °C, 2013 0.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.4 °C 06:03 9.2 °C 14.3 °C, 2017 2.2 °C, 2010
Day Maximum (09-21) 11.8 °C 14:53 14.1 °C 18.3 °C, 2013 9.4 °C, 2010
Max 10m Temp Rise 0.4 °C 09:32 0.4 °C 0.8 °C, 2009 0.2 °C, 2012
Max 1hr Temp Rise 1.2 °C 10:07 1.5 °C 2.1 °C, 2009 0.7 °C, 2012
Max 1hr Hum Rise 3% 16:05 6% 13%, 2011 2%, 2016
Max 10m Temp Fall 0.3 °C 01:24 0.4 °C 0.6 °C, 2025 0.2 °C, 2013
Max 1hr Temp Fall 0.8 °C 01:01 1.2 °C 2.3 °C, 2010 0.5 °C, 2013
Max 1hr Hum Fall 6% 12:14 7% 16%, 2009 2%, 2016
Max 10m Wind Speed 8.9 mph 04:46 9.0 mph 15.2 mph, 2019 3.1 mph, 2016
Minimum Feels-like 5.3 °C 04:42 7.3 °C 15.1 °C, 2013 -1.5 °C, 2010
Maximum Feels-like 12.4 °C 01:00 15.7 °C 22.5 °C, 2013 9.4 °C, 2010
Mean Feels-like 9.6 °C 12.0 °C 18.3 °C, 2013 4.3 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.4 °C (-2.4) 5.4 °C (-0.8) 8.7 °C (+2.9), 2017 3.4 °C (-2.4), 2020
Humidity Range 13% 19% 38%, 2014 5%, 2016
Pressure Range 2 hPa 7 hPa 11 hPa, 2013 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4.2 [47%]60 hrs (63%) [25%] 8.8 [98%], 2010 0 [0%], 2019
Wet Hours 4
[Mean rain rate: 0.5 mm/h]		113 hrs (285%) [19%] 4, 2020 0, 2009
Cloud Cover Partly Cloudy with periods of Mostly Sunny
Events None
Comments o.night, am rn/shs
Extra Comments
Issues None known
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 25th 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