Daily Report for 22nd November 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.8 °C (-5.4) 02:11 6.2 °C (+0.4) 13.3 °C (+8.7), 2017 -1.9 °C (-6.5), 2015
Maximum Temperature 5.1 °C (-5.1) 19:38 11.8 °C (+0.8) 15.6 °C (+5.4), 2017 5.1 °C (-5.1), 2018
Mean Temperature 2.6 °C (-5.2) 9.0 °C (+0.6) 14.2 °C, 2017 1.8 °C, 2015
Minimum Humidity 89% 21:22 75% 96%, 2014 59%, 2015
Maximum Humidity 94% 08:29 94% 98%, 2011 79%, 2016
Mean Humidity 92% 86% 97%, 2011 73%, 2016
Minimum Pressure 1017 hPa 20:13 1009 hPa 1028 hPa, 2023 986 hPa, 2022
Maximum Pressure 1019 hPa 00:51 1018 hPa 1034 hPa, 2021 994 hPa, 2022
Mean Pressure 1018 hPa 1014 hPa 1030 hPa, 2021 990 hPa, 2022
Mean Wind Speed 1.2 mph (-3.4) 4.7 mph (+0.1) 12.2 mph, 2017 1.2 mph, 2018
Maximum Wind Speed 5.5 mph 21:24 13.8 mph 27.5 mph, 2012 5.5 mph, 2018
Maximum Gust 9.2 mph 17:54 21.4 mph 41.5 mph, 2017 8.1 mph, 2011
Mean Wind Direction ENE
Rainfall 0.0 mm 55.2 mm (112%) 7.9 mm, 2009
Maximum Hourly Rain n/a 5.5, 2012
Maximum 10-min Rain n/a 3.2, 2012
Maximum Rain Rate n/a 40, 2012
Minimum Dew Point -1.8 °C 02:11 4.5 °C 9.3 °C, 2014 -7.2 °C, 2015
Maximum Dew Point 4.0 °C 18:02 8.6 °C 13.7 °C, 2014 1.2 °C, 2015
Mean Dew Point 1.5 °C 6.7 °C 12.2 °C, 2014 -1.9 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.8 °C 02:11 6.6 °C 13.3 °C, 2017 -1.9 °C, 2015
Day Maximum (09-21) 5.1 °C 19:56 11.7 °C 15.6 °C, 2017 5.1 °C, 2018
Max 10m Temp Rise 0.3 °C 09:22 0.4 °C 0.5 °C, 2015 0.2 °C, 2010
Max 1hr Temp Rise 1.4 °C 09:15 1.5 °C 1.7 °C, 2015 0.7 °C, 2011
Max 1hr Hum Rise 3% 01:05 6% 12%, 2012 1%, 2014
Max 10m Temp Fall 0.4 °C 00:32 0.4 °C 0.8 °C, 2012 0.1 °C, 2014
Max 1hr Temp Fall 0.9 °C 01:01 1.3 °C 2.3 °C, 2021 0.3 °C, 2014
Max 1hr Hum Fall 3% 21:00 7% 10%, 2021 1%, 2014
Max 10m Wind Speed 4.0 mph 21:28 10.1 mph 18.7 mph, 2012 4.0 mph, 2018
Minimum Feels-like -4.1 °C 05:46 3.7 °C 13.7 °C, 2017 -5.3 °C, 2015
Maximum Feels-like 5.1 °C 19:23 12.4 °C 17.5 °C, 2014 5.1 °C, 2018
Mean Feels-like 1.9 °C 8.4 °C 15.4 °C, 2017 0.1 °C, 2015
Air-frost Hrs 7 hrs 0.3 hrs 8 hrs, 2015 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.9 °C (+0.3) 5.6 °C (+0.4) 7.9 °C (+2.3), 2020 2.0 °C (-3.6), 2010
Humidity Range 5% 19% 31%, 2013 1%, 2014
Pressure Range 3 hPa 8 hPa 22 hPa, 2016 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]82 hrs (130%) [46%] 8 [105%], 2021 0 [0%], 2011
Wet Hours 056 hrs (121%) [11%] 5, 2019 0, 2015
Cloud Cover Overcast
Events Air Frost
Comments -
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 22nd 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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