Daily Report for 30th November 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.7 °C (+0.6) 00:02 5.3 °C (-0.1) 8.6 °C (+4.5), 2015 -2.9 °C (-7.0), 2016
Maximum Temperature 11.6 °C (+2.2) 15:48 10.5 °C (-0.1) 13.5 °C (+4.1), 2024 1.0 °C (-8.4), 2010
Mean Temperature 9.4 °C (+1.4) 8.0 °C (-0.1) 11.7 °C, 2024 0.3 °C, 2010
Minimum Humidity 83% 21:45 76% 87%, 2010 62%, 2016
Maximum Humidity 91% 00:11 92% 98%, 2009 80%, 2016
Mean Humidity 87% 85% 94%, 2010 71%, 2016
Minimum Pressure 999 hPa 23:59 1014 hPa 1032 hPa, 2016 985 hPa, 2009
Maximum Pressure 1015 hPa 01:20 1022 hPa 1035 hPa, 2016 1006 hPa, 2023
Mean Pressure 1010 hPa 1018 hPa 1034 hPa, 2016 998 hPa, 2009
Mean Wind Speed 8.9 mph (+4.3) 3.8 mph (-0.8) 8.9 mph, 2021 1.0 mph, 2016
Maximum Wind Speed 18.0 mph 22:53 10.9 mph 21.0 mph, 2015 5.3 mph, 2022
Maximum Gust 28.5 mph 20:34 18.6 mph 37.3 mph, 2015 8.1 mph, 2022
Mean Wind Direction W
Rainfall 0.5 mm 8.0 mm (12%) 15.3 mm, 2009
Maximum Hourly Rain 0.5 mm 23:58 4.1 mm, 2009
Maximum 10-min Rain 0.3 mm 23:58 1.0 mm, 2015
Maximum Rain Rate 0.5 mm/h 23:58 36 mm/h, 2015
Minimum Dew Point 3.2 °C 00:00 3.3 °C 5.7 °C, 2024 -6.4 °C, 2016
Maximum Dew Point 9.2 °C 18:47 8.0 °C 12.2 °C, 2024 -0.7 °C, 2016
Mean Dew Point 7.3 °C 5.7 °C 10.4 °C, 2024 -3.8 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 3.3 °C * 22:04 5.8 °C 8.6 °C, 2015 -2.9 °C, 2016
Day Maximum (09-21) 11.6 °C 15:53 10.4 °C 13.5 °C, 2024 1.0 °C, 2010
Max 10m Temp Rise 0.3 °C 06:38 0.4 °C 0.8 °C, 2016 0.1 °C, 2010
Max 1hr Temp Rise 1.0 °C 09:59 1.2 °C 2.8 °C, 2016 0.4 °C, 2010
Max 1hr Hum Rise 4% 23:54 5% 9%, 2011 2%, 2010
Max 10m Temp Fall 0.2 °C 23:42 0.4 °C 0.6 °C, 2015 0.1 °C, 2010
Max 1hr Temp Fall 0.3 °C 23:51 1.2 °C 2.8 °C, 2015 0.3 °C, 2021
Max 1hr Hum Fall 3% 19:46 6% 15%, 2020 2%, 2024
Max 10m Wind Speed 14.0 mph 21:22 8.1 mph 15.7 mph, 2015 3.9 mph, 2022
Minimum Feels-like 0.0 °C 00:21 2.7 °C 6.0 °C, 2024 -7.4 °C, 2010
Maximum Feels-like 12.5 °C 15:48 10.8 °C 15.9 °C, 2024 0.8 °C, 2010
Mean Feels-like 8.3 °C 7.3 °C 13.0 °C, 2024 -3.9 °C, 2010
Air-frost Hrs 0 hrs 0.6 hrs 13 hrs, 2012 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.9 °C (+1.6) 5.2 °C (-0.1) 8.7 °C (+3.4), 2016 1.8 °C (-3.5), 2010
Humidity Range 8% 16% 24%, 2020 8%, 2021
Pressure Range 16 hPa 8 hPa 25 hPa, 2009 3 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]96 hrs (114%) [41%] 7.2 [98%], 2016 0 [0%], 2010
Wet Hours 1
[Mean rain rate: 0.5 mm/h]		18 hrs (28%) [2.4%] 10, 2009 0, 2012
Cloud Cover Overcast or Mostly Cloudy
Events None
Comments late rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 6.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 30th 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose