Daily Report for 27th November 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.8 °C (-2.4) 23:53 5.8 °C (+0.3) 9.8 °C (+5.6), 2022 -3.5 °C (-7.7), 2010
Maximum Temperature 4.7 °C (-5.0) 11:12 10.9 °C (+0.2) 13.7 °C (+4.0), 2015 1.0 °C (-8.7), 2010
Mean Temperature 3.2 °C (-3.7) 8.4 °C (+0.2) 11.5 °C, 2022 -1.5 °C, 2010
Minimum Humidity 78% 23:21 76% 91%, 2014 47%, 2011
Maximum Humidity 92% 04:34 92% 98%, 2012 79%, 2016
Mean Humidity 86% 86% 94%, 2022 68%, 2011
Minimum Pressure 982 hPa 02:21 1015 hPa 1031 hPa, 2013 981 hPa, 2019
Maximum Pressure 1005 hPa 23:54 1023 hPa 1035 hPa, 2013 989 hPa, 2019
Mean Pressure 995 hPa 1019 hPa 1033 hPa, 2013 985 hPa, 2019
Mean Wind Speed 9.7 mph (+5.1) 3.5 mph (-1.1) 9.7 mph, 2021 1.2 mph, 2020
Maximum Wind Speed 18.9 mph 16:40 10.5 mph 20.8 mph, 2015 5.9 mph, 2013
Maximum Gust 34.2 mph 16:40 17.5 mph 34.2 mph, 2021 7.8 mph, 2013
Mean Wind Direction NNW
Rainfall 3.8 mm 7.5 mm (12%) 24.9 mm, 2024
Maximum Hourly Rain 1.2 mm 02:05 8.7 mm, 2024
Maximum 10-min Rain 0.5 mm 01:15 2.4 mm, 2024
Maximum Rain Rate 3.6 mm/h 01:15 30 mm/h, 2024
Minimum Dew Point -1.6 °C 23:48 3.8 °C 8.8 °C, 2022 -5.8 °C, 2010
Maximum Dew Point 3.0 °C 11:18 8.4 °C 12.1 °C, 2022 -0.4 °C, 2010
Mean Dew Point 1.1 °C 6.1 °C 10.6 °C, 2022 -3.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 1.9 °C * 04:08 6.4 °C 11.6 °C, 2011 -3.5 °C, 2010
Day Maximum (09-21) 4.7 °C 11:12 10.9 °C 13.7 °C, 2015 1.0 °C, 2010
Max 10m Temp Rise 0.4 °C 09:30 0.4 °C 0.9 °C, 2020 0.2 °C, 2011
Max 1hr Temp Rise 1.2 °C 10:00 1.2 °C 2.0 °C, 2020 0.4 °C, 2023
Max 1hr Hum Rise 6% 01:01 5% 9%, 2016 1%, 2014
Max 10m Temp Fall 0.5 °C 03:22 0.4 °C 1.2 °C, 2015 0.2 °C, 2012
Max 1hr Temp Fall 1.3 °C 03:56 1.2 °C 3.4 °C, 2015 0.5 °C, 2014
Max 1hr Hum Fall 5% 19:17 6% 10%, 2009 2%, 2013
Max 10m Wind Speed 14.1 mph 16:40 7.7 mph 17.3 mph, 2015 4.4 mph, 2013
Minimum Feels-like -4.8 °C 03:46 3.5 °C 8.0 °C, 2022 -8.4 °C, 2010
Maximum Feels-like 1.5 °C 10:01 11.3 °C 15.9 °C, 2015 1.0 °C, 2010
Mean Feels-like -1.8 °C 8.0 °C 13.0 °C, 2022 -3.5 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 19 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.9 °C (-2.6) 5.2 °C (-0.1) 9.7 °C (+4.2), 2011 1.4 °C (-4.1), 2014
Humidity Range 14% 16% 38%, 2011 5%, 2022
Pressure Range 23 hPa 8 hPa 23 hPa, 2021 4 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.3 [4%]88 hrs (116%) [41%] 6 [81%], 2011 0 [0%], 2012
Wet Hours 6
[Mean rain rate: 0.6 mm/h]		17 hrs (29%) [2.5%] 10, 2019 0, 2009
Cloud Cover Mostly Cloudy or Overcast
Events None
Comments rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 6.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 27th November 2021.
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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose