Daily Report for 21st November 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.4 °C (+1.8) 22:05 5.0 °C (-0.7) 11.7 °C (+7.1), 2017 -0.7 °C (-5.3), 2024
Maximum Temperature 11.9 °C (+1.8) 00:27 10.7 °C (-0.2) 15.0 °C (+4.8), 2009 3.0 °C (-7.2), 2024
Mean Temperature 9.3 °C (+1.8) 8.0 °C (-0.5) 12.7 °C, 2017 0.6 °C, 2024
Minimum Humidity 85% 14:21 73% 96%, 2011 55%, 2015
Maximum Humidity 95% 22:37 94% 98%, 2009 80%, 2016
Mean Humidity 92% 86% 98%, 2011 69%, 2015
Minimum Pressure 1000 hPa 14:01 1006 hPa 1025 hPa, 2020 983 hPa, 2022
Maximum Pressure 1016 hPa 22:02 1014 hPa 1031 hPa, 2023 994 hPa, 2016
Mean Pressure 1007 hPa 1010 hPa 1027 hPa, 2020 988 hPa, 2016
Mean Wind Speed 5.7 mph (+1.1) 4.1 mph (-0.5) 8.9 mph, 2020 0.8 mph, 2021
Maximum Wind Speed 20.4 mph 14:14 12.2 mph 21.3 mph, 2022 8.1 mph, 2021
Maximum Gust 35.1 mph 14:14 17.6 mph 35.1 mph, 2012 13.2 mph, 2011
Mean Wind Direction SSW
Rainfall 6.6 mm 42.4 mm (90%) 15.0 mm, 2016
Maximum Hourly Rain 3.5 mm 14:52 4.4 mm, 2009
Maximum 10-min Rain 1.5 mm 14:14 2.1 mm, 2016
Maximum Rain Rate 36 mm/h 14:08 54 mm/h, 2016
Minimum Dew Point 5.7 °C 21:42 3.0 °C 9.3 °C, 2017 -7.4 °C, 2015
Maximum Dew Point 10.8 °C 00:16 8.4 °C 13.2 °C, 2009 0.0 °C, 2024
Mean Dew Point 8.0 °C 5.7 °C 11.3 °C, 2009 -2.5 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.8 °C * 08:50 5.7 °C 11.7 °C, 2017 -0.7 °C, 2024
Day Maximum (09-21) * 10.9 °C * 13:27 10.5 °C 15.0 °C, 2009 3.0 °C, 2024
Max 10m Temp Rise 0.2 °C 12:07 0.4 °C 0.6 °C, 2015 0.1 °C, 2010
Max 1hr Temp Rise 0.5 °C 11:18 1.3 °C 2.6 °C, 2015 0.4 °C, 2010
Max 1hr Hum Rise 6% 15:21 5% 8%, 2013 1%, 2011
Max 10m Temp Fall 1.1 °C 14:21 0.4 °C 1.1 °C, 2012 0.2 °C, 2010
Max 1hr Temp Fall 2.9 °C 15:07 1.4 °C 2.9 °C, 2012 0.4 °C, 2019
Max 1hr Hum Fall 8% 14:21 8% 15%, 2015 2%, 2014
Max 10m Wind Speed 15.7 mph 14:21 8.8 mph 15.8 mph, 2022 6.2 mph, 2021
Minimum Feels-like 2.6 °C 15:49 2.9 °C 12.9 °C, 2017 -5.9 °C, 2024
Maximum Feels-like 13.6 °C 00:00 11.3 °C 17.6 °C, 2009 2.6 °C, 2024
Mean Feels-like 8.5 °C 7.3 °C 14.2 °C, 2009 -1.7 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 6 hrs, 2024 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.5 °C (-0.1) 5.7 °C (+0.5) 7.5 °C (+1.9), 2016 2.1 °C (-3.5), 2010
Humidity Range 10% 21% 38%, 2015 2%, 2011
Pressure Range 16 hPa 9 hPa 26 hPa, 2022 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]55 hrs (92%) [32%] 4.2 [55%], 2015 0 [0%], 2012
Wet Hours 5
[Mean rain rate: 1.3 mm/h]		33 hrs (74%) [6.5%] 10, 2016 0, 2010
Cloud Cover Overcast
Events None
Comments 07-10 & 12 Light, 14-16 Heavy Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 21st November 2012.
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

daycamsum

Wind rose