Daily Report for 17th October 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.6 °C (+0.1) 23:49 8.1 °C (-1.0) 13.6 °C (+5.1), 2014 3.5 °C (-5.0), 2010
Maximum Temperature 12.1 °C (-2.5) 14:54 13.7 °C (-1.8) 18.7 °C (+4.1), 2014 12.0 °C (-2.6), 2010
Mean Temperature 9.9 °C (-1.2) 10.8 °C (-1.4) 16.0 °C, 2014 7.6 °C, 2010
Minimum Humidity 76% 18:18 74% 83%, 2018 49%, 2010
Maximum Humidity 91% 03:42 94% 96%, 2012 84%, 2010
Mean Humidity 86% 87% 90%, 2018 68%, 2010
Minimum Pressure 1023 hPa 14:57 1007 hPa 1028 hPa, 2009 993 hPa, 2012
Maximum Pressure 1024 hPa 21:55 1014 hPa 1033 hPa, 2009 1003 hPa, 2012
Mean Pressure 1024 hPa 1010 hPa 1030 hPa, 2009 997 hPa, 2012
Mean Wind Speed 1.2 mph (-2.9) 3.4 mph (-0.7) 7.6 mph, 2023 1.2 mph, 2020
Maximum Wind Speed 11.2 mph 18:14 12.7 mph 18.5 mph, 2012 7.6 mph, 2010
Maximum Gust 16.1 mph 18:15 20.5 mph 29.7 mph, 2011 10.9 mph, 2010
Mean Wind Direction NNE
Rainfall 0.0 mm 122.5 mm (344%) 9.5 mm, 2012
Maximum Hourly Rain n/a 4, 2012
Maximum 10-min Rain n/a 1.7, 2012
Maximum Rain Rate n/a 30, 2012
Minimum Dew Point 6.3 °C 18:33 6.5 °C 13.0 °C, 2014 0.0 °C, 2010
Maximum Dew Point 8.6 °C 14:06 10.8 °C 15.7 °C, 2014 5.0 °C, 2009
Mean Dew Point 7.6 °C 8.7 °C 14.1 °C, 2014 1.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.2 °C * 08:18 8.6 °C 14.7 °C, 2022 5.5 °C, 2010
Day Maximum (09-21) 12.1 °C 14:54 13.6 °C 18.7 °C, 2014 12.0 °C, 2010
Max 10m Temp Rise 0.2 °C 11:41 0.4 °C 0.7 °C, 2010 0.2 °C, 2018
Max 1hr Temp Rise 0.8 °C 14:07 1.6 °C 3.4 °C, 2011 0.7 °C, 2018
Max 1hr Hum Rise 6% 19:17 7% 16%, 2012 3%, 2018
Max 10m Temp Fall 0.4 °C 15:20 0.5 °C 1.0 °C, 2012 0.2 °C, 2014
Max 1hr Temp Fall 1.2 °C 15:53 1.3 °C 2.7 °C, 2010 0.6 °C, 2015
Max 1hr Hum Fall 5% 14:14 8% 14%, 2019 3%, 2018
Max 10m Wind Speed 3.0 mph 18:21 8.4 mph 14.2 mph, 2017 3.0 mph, 2020
Minimum Feels-like 7.0 °C 08:16 6.3 °C 16.4 °C, 2014 0.0 °C, 2009
Maximum Feels-like 12.7 °C 14:55 15.1 °C 22.4 °C, 2014 0.0 °C, 2009
Mean Feels-like 10.0 °C 11.1 °C 19.4 °C, 2014 0.0 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.5 °C (-2.6) 5.6 °C (-0.8) 8.5 °C (+2.4), 2010 2.6 °C (-3.5), 2015
Humidity Range 15% 20% 40%, 2012 12%, 2018
Pressure Range 2 hPa 7 hPa 16 hPa, 2022 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]40 hrs (59%) [24%] 6 [63%], 2010 0 [0%], 2018
Wet Hours 089 hrs (329%) [22%] 5, 2012 0, 2009
Cloud Cover Overcast
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 11.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 17th 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