Daily Report for 22nd November 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.3 °C (+1.7) 23:59 8.5 °C (+2.8) 13.3 °C (+8.7), 2017 -1.9 °C (-6.5), 2015
Maximum Temperature 12.5 °C (+2.3) 15:10 12.9 °C (+1.9) 15.6 °C (+5.4), 2017 5.1 °C (-5.1), 2018
Mean Temperature 10.4 °C (+2.0) 10.8 °C (+2.4) 14.2 °C, 2017 1.8 °C, 2015
Minimum Humidity 91% 23:11 83% 96%, 2014 59%, 2015
Maximum Humidity 98% 96% 98%, 2011 79%, 2016
Mean Humidity 97% 91% 97%, 2011 73%, 2016
Minimum Pressure 1015 hPa 01:34 1012 hPa 1028 hPa, 2023 986 hPa, 2022
Maximum Pressure 1024 hPa 23:56 1019 hPa 1034 hPa, 2021 994 hPa, 2022
Mean Pressure 1020 hPa 1015 hPa 1030 hPa, 2021 990 hPa, 2022
Mean Wind Speed 1.4 mph (-3.2) 3.9 mph (-0.7) 12.2 mph, 2017 1.2 mph, 2018
Maximum Wind Speed 6.2 mph 10.7 mph 27.5 mph, 2012 5.5 mph, 2018
Maximum Gust 8.1 mph 16:20 14.7 mph 41.5 mph, 2017 8.1 mph, 2011
Mean Wind Direction N
Rainfall 0.5 mm 24.1 mm (49%) 7.9 mm, 2009
Maximum Hourly Rain n/a 07:29 5.5, 2012
Maximum 10-min Rain n/a 07:29 3.2, 2012
Maximum Rain Rate n/a 40, 2012
Minimum Dew Point 5.3 °C 23:59 7.2 °C 9.3 °C, 2014 -7.2 °C, 2015
Maximum Dew Point 12.2 °C 15:10 11.4 °C 13.7 °C, 2014 1.2 °C, 2015
Mean Dew Point 10.0 °C 9.3 °C 12.2 °C, 2014 -1.9 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.2 °C * 21:00 9.1 °C 13.3 °C, 2017 -1.9 °C, 2015
Day Maximum (09-21) 12.5 °C 15:08 12.8 °C 15.6 °C, 2017 5.1 °C, 2018
Max 10m Temp Rise 0.2 °C 10:34 0.3 °C 0.5 °C, 2015 0.2 °C, 2010
Max 1hr Temp Rise 0.7 °C 13:08 0.9 °C 1.7 °C, 2015 0.7 °C, 2011
Max 1hr Hum Rise 2% 23:49 3% 12%, 2012 1%, 2014
Max 10m Temp Fall 0.2 °C 23:21 0.4 °C 0.8 °C, 2012 0.1 °C, 2014
Max 1hr Temp Fall 0.8 °C 23:59 1.3 °C 2.3 °C, 2021 0.3 °C, 2014
Max 1hr Hum Fall 3% 20:37 6% 10%, 2021 1%, 2014
Max 10m Wind Speed 4.4 mph 19:59 7.3 mph 18.7 mph, 2012 4.0 mph, 2018
Minimum Feels-like 6.3 °C 23:59 7.4 °C 13.7 °C, 2017 -5.3 °C, 2015
Maximum Feels-like 14.9 °C 13:49 14.7 °C 17.5 °C, 2014 5.1 °C, 2018
Mean Feels-like 11.5 °C 11.4 °C 15.4 °C, 2017 0.1 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 8 hrs, 2015 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.2 °C (+0.6) 4.4 °C (-0.8) 7.9 °C (+2.3), 2020 2.0 °C (-3.6), 2010
Humidity Range 7% 14% 31%, 2013 1%, 2014
Pressure Range 9 hPa 6 hPa 22 hPa, 2016 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]44 hrs (71%) [25%] 8 [105%], 2021 0 [0%], 2011
Wet Hours 1
[Mean rain rate: 0.5 mm/h]		23 hrs (49%) [4.3%] 5, 2019 0, 2015
Cloud Cover Overcast
Events Dense Fog
Comments am Dense Fog; 07, 17 Light Showers
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 2011.
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

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Webcam Summary of Cloud Conditions

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Wind rose