Daily Report for 18th November 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.1 °C (-5.2) 23:54 3.9 °C (-2.0) 10.9 °C (+5.8), 2009 -0.1 °C (-5.2), 2019
Maximum Temperature 7.9 °C (-2.5) 13:17 9.7 °C (-1.5) 15.2 °C (+4.8), 2020 7.3 °C (-3.1), 2016
Mean Temperature 5.2 °C (-3.8) 7.1 °C (-1.7) 12.7 °C, 2015 4.7 °C, 2012
Minimum Humidity 76% 14:22 77% 92%, 2013 60%, 2016
Maximum Humidity 95% 00:13 95% 98%, 2010 77%, 2016
Mean Humidity 86% 88% 96%, 2013 70%, 2016
Minimum Pressure 1014 hPa 00:43 995 hPa 1028 hPa, 2021 991 hPa, 2016
Maximum Pressure 1018 hPa 21:00 1005 hPa 1031 hPa, 2021 998 hPa, 2016
Mean Pressure 1016 hPa 1000 hPa 1030 hPa, 2021 994 hPa, 2016
Mean Wind Speed 4.1 mph (-0.5) 4.1 mph (-0.5) 11.0 mph, 2009 1.6 mph, 2012
Maximum Wind Speed 11.9 mph 04:41 11.9 mph 22.8 mph, 2015 5.4 mph, 2012
Maximum Gust 18.4 mph 02:42 19.0 mph 37.1 mph, 2015 7.6 mph, 2012
Mean Wind Direction NNW
Rainfall 0.4 mm 43.2 mm (107%) 16.1 mm, 2024
Maximum Hourly Rain 0.2 mm 4.1 mm, 2024
Maximum 10-min Rain 0.2 mm 1.0 mm, 2024
Maximum Rain Rate n/a 8, 2010
Minimum Dew Point -1.4 °C 23:54 2.6 °C 7.2 °C, 2009 -1.4 °C, 2019
Maximum Dew Point 6.0 °C 00:21 7.5 °C 13.9 °C, 2023 2.6 °C, 2016
Mean Dew Point 3.1 °C 5.2 °C 11.1 °C, 2023 0.3 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 4.4 °C * 21:00 4.7 °C 11.6 °C, 2020 1.0 °C, 2012
Day Maximum (09-21) 7.9 °C 13:38 9.6 °C 15.2 °C, 2020 7.2 °C, 2016
Max 10m Temp Rise 0.4 °C 19:27 0.4 °C 0.6 °C, 2012 0.1 °C, 2013
Max 1hr Temp Rise 1.1 °C 10:13 1.5 °C 1.9 °C, 2012 0.3 °C, 2013
Max 1hr Hum Rise 4% 16:18 6% 11%, 2020 2%, 2013
Max 10m Temp Fall 0.4 °C 16:51 0.4 °C 1.0 °C, 2020 0.2 °C, 2010
Max 1hr Temp Fall 1.7 °C 21:14 1.4 °C 3.0 °C, 2020 0.5 °C, 2009
Max 1hr Hum Fall 5% 03:40 7% 13%, 2018 2%, 2023
Max 10m Wind Speed 8.6 mph 11:54 8.7 mph 16.9 mph, 2015 4.1 mph, 2012
Minimum Feels-like -1.6 °C 21:29 0.9 °C 11.1 °C, 2009 -2.1 °C, 2016
Maximum Feels-like 7.2 °C 14:08 9.9 °C 17.7 °C, 2023 5.8 °C, 2016
Mean Feels-like 3.1 °C 5.8 °C 13.6 °C, 2023 1.8 °C, 2016
Air-frost Hrs 0.2 hrs 0.0 hrs 0.2 hrs, 2019 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.0 °C (+2.7) 5.7 °C (+0.6) 8.0 °C (+2.7), 2019 2.9 °C (-2.4), 2009
Humidity Range 19% 18% 29%, 2018 6%, 2013
Pressure Range 4 hPa 10 hPa 18 hPa, 2022 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [64%]52 hrs (101%) [36%] 7.8 [100%], 2018 0 [0%], 2009
Wet Hours 2
[Mean rain rate: 0.2 mm/h]		57 hrs (151%) [13%] 12, 2024 0, 2011
Cloud Cover Sunny with periods of Partly Cloudy
Events None
Comments o.night rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 5.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 18th November 2019.
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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