Daily Report for 22nd February 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.3 °C (+1.3) 07:09 5.0 °C (+2.1) 10.9 °C (+8.0), 2017 -0.8 °C (-3.8), 2015
Maximum Temperature 7.3 °C (-1.2) 20:45 9.2 °C (+1.1) 14.8 °C (+6.3), 2019 1.4 °C (-7.1), 2013
Mean Temperature 5.9 °C (+0.1) 7.3 °C (+1.6) 12.2 °C, 2017 0.6 °C, 2013
Minimum Humidity 86% 14:30 75% 94%, 2010 49%, 2014
Maximum Humidity 94% 05:30 93% 98%, 2010 66%, 2013
Mean Humidity 90% 85% 97%, 2010 57%, 2013
Minimum Pressure 1014 hPa 02:55 1010 hPa 1032 hPa, 2019 976 hPa, 2024
Maximum Pressure 1019 hPa 21:10 1015 hPa 1036 hPa, 2019 991 hPa, 2010
Mean Pressure 1016 hPa 1013 hPa 1035 hPa, 2019 986 hPa, 2024
Mean Wind Speed 2.8 mph (-2.3) 6.2 mph (+1.1) 13.0 mph, 2020 0.6 mph, 2021
Maximum Wind Speed 8.7 mph 14.1 mph 24.0 mph, 2020 8.2 mph, 2021
Maximum Gust 10.5 mph 23:08 20.3 mph 39.2 mph, 2020 10.5 mph, 2011
Mean Wind Direction SSE
Rainfall 0.5 mm 32.7 mm (92%) 13.0 mm, 2010
Maximum Hourly Rain 0.5 mm 01:46 3.6 mm, 2024
Maximum 10-min Rain n/a 01:25 1.6, 2024
Maximum Rain Rate n/a 01:46 30, 2024
Minimum Dew Point 3.3 °C 07:40 2.6 °C 7.7 °C, 2017 -8.2 °C, 2013
Maximum Dew Point 5.5 °C 19:09 6.9 °C 10.8 °C, 2024 -5.0 °C, 2013
Mean Dew Point 4.3 °C 4.8 °C 8.9 °C, 2025 -6.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.3 °C 07:00 5.3 °C 11.2 °C, 2017 -0.8 °C, 2015
Day Maximum (09-21) 7.3 °C 20:45 9.2 °C 14.8 °C, 2019 1.4 °C, 2013
Max 10m Temp Rise 0.2 °C 09:33 0.3 °C 1.7 °C, 2025 0.1 °C, 2010
Max 1hr Temp Rise 0.8 °C 10:25 1.0 °C 2.5 °C, 2019 0.4 °C, 2010
Max 1hr Hum Rise 2% 02:26 4% 14%, 2015 1%, 2010
Max 10m Temp Fall 0.1 °C 01:35 0.2 °C 1.7 °C, 2025 0.1 °C, 2011
Max 1hr Temp Fall 0.3 °C 02:25 0.7 °C 3.3 °C, 2024 0.3 °C, 2011
Max 1hr Hum Fall 3% 11:08 6% 20%, 2016 1%, 2010
Max 10m Wind Speed 5.5 mph 23:13 9.9 mph 18.4 mph, 2020 5.5 mph, 2011
Minimum Feels-like 1.9 °C 06:55 1.8 °C 11.6 °C, 2017 -6.3 °C, 2013
Maximum Feels-like 7.3 °C 20:30 9.3 °C 15.9 °C, 2019 -1.1 °C, 2013
Mean Feels-like 5.2 °C 5.8 °C 12.9 °C, 2017 -4.0 °C, 2013
Air-frost Hrs 0 hrs 0.2 hrs 3 hrs, 2015 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.0 °C (-2.6) 4.2 °C (-1.0) 10.0 °C (+4.4), 2015 1.5 °C (-4.1), 2013
Humidity Range 8% 18% 42%, 2016 4%, 2010
Pressure Range 5 hPa 5 hPa 23 hPa, 2024 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]29 hrs (48%) [15%] 7.4 [79%], 2019 0 [0%], 2010
Wet Hours 1
[Mean rain rate: 0.5 mm/h]		36 hrs (89%) [6.9%] 10, 2010 , 2009
Cloud Cover Overcast
Events None
Comments 00-02 broken Light Rain/Drizzle
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 22nd February 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