Daily Report for 20th November 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.1 °C (-2.7) 22:14 6.8 °C (+0.9) 10.8 °C (+6.0), 2012 -0.9 °C (-5.8), 2024
Maximum Temperature 4.9 °C (-5.4) 06:40 12.3 °C (+1.3) 13.8 °C (+3.5), 2009 4.4 °C (-5.9), 2024
Mean Temperature 3.8 °C (-4.1) 9.5 °C (+1.1) 12.4 °C, 2009 1.1 °C, 2024
Minimum Humidity 81% 06:32 74% 96%, 2011 63%, 2015
Maximum Humidity 94% 23:19 94% 98%, 2010 83%, 2016
Mean Humidity 88% 86% 98%, 2011 78%, 2015
Minimum Pressure 1006 hPa 23:53 1009 hPa 1029 hPa, 2020 969 hPa, 2016
Maximum Pressure 1014 hPa 00:01 1018 hPa 1037 hPa, 2020 995 hPa, 2016
Mean Pressure 1009 hPa 1013 hPa 1034 hPa, 2020 986 hPa, 2016
Mean Wind Speed 6.1 mph (+1.5) 4.9 mph (+0.3) 8.0 mph, 2016 0.8 mph, 2011
Maximum Wind Speed 17.4 mph 05:18 14.3 mph 21.9 mph, 2016 4.5 mph, 2011
Maximum Gust 23.0 mph 06:38 22.1 mph 37.1 mph, 2016 6.0 mph, 2011
Mean Wind Direction NE
Rainfall 5.5 mm 54.5 mm (122%) 19.2 mm, 2016
Maximum Hourly Rain 1.3 mm 20:32 5.3 mm, 2022
Maximum 10-min Rain 0.4 mm 15:17 1.9 mm, 2022
Maximum Rain Rate 3.3 mm/h 15:17 36 mm/h, 2013
Minimum Dew Point 1.1 °C 22:14 5.1 °C 9.1 °C, 2012 -3.6 °C, 2013
Maximum Dew Point 2.6 °C 12:03 9.1 °C 12.7 °C, 2009 1.1 °C, 2024
Mean Dew Point 2.0 °C 7.2 °C 10.8 °C, 2012 -0.9 °C, 2024
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 4.1 °C * 22:07 7.2 °C 12.7 °C, 2009 -0.9 °C, 2024
Day Maximum (09-21) * 4.8 °C * 09:22 12.3 °C 13.8 °C, 2009 4.4 °C, 2024
Max 10m Temp Rise 0.2 °C 01:30 0.4 °C 0.5 °C, 2019 0.1 °C, 2021
Max 1hr Temp Rise 0.6 °C 08:39 1.4 °C 1.9 °C, 2020 0.3 °C, 2015
Max 1hr Hum Rise 7% 07:34 6% 8%, 2012 1%, 2011
Max 10m Temp Fall 0.4 °C 07:30 0.4 °C 1.8 °C, 2013 0.2 °C, 2014
Max 1hr Temp Fall 0.7 °C 07:39 1.3 °C 3.3 °C, 2013 0.5 °C, 2020
Max 1hr Hum Fall 7% 08:43 8% 10%, 2013 2%, 2010
Max 10m Wind Speed 12.4 mph 04:24 10.5 mph 17.4 mph, 2016 3.4 mph, 2011
Minimum Feels-like -2.0 °C 16:57 4.4 °C 11.8 °C, 2012 -6.6 °C, 2024
Maximum Feels-like 3.2 °C 15:21 13.1 °C 16.3 °C, 2009 3.0 °C, 2024
Mean Feels-like 0.4 °C 9.1 °C 13.8 °C, 2012 -2.4 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 8 hrs, 2024 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.8 °C (-2.6) 5.5 °C (+0.3) 8.2 °C (+2.8), 2020 2.2 °C (-3.2), 2021
Humidity Range 13% 19% 28%, 2019 2%, 2011
Pressure Range 8 hPa 9 hPa 26 hPa, 2016 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]79 hrs (137%) [49%] 5 [65%], 2024 0 [0%], 2010
Wet Hours 14
[Mean rain rate: 0.4 mm/h]		54 hrs (128%) [11%] 14, 2018 0, 2010
Cloud Cover Overcast
Events None
Comments am spells, pm persistent rain
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 20th November 2018.
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