Daily Report for 21st February 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.6 °C (+0.7) 00:32 5.1 °C (+2.2) 11.4 °C (+8.5), 2016 -1.2 °C (-4.1), 2010
Maximum Temperature 6.4 °C (-2.0) 14:26 9.3 °C (+1.3) 14.5 °C (+6.1), 2016 1.8 °C (-6.6), 2013
Mean Temperature 5.0 °C (-0.7) 7.3 °C (+1.7) 12.8 °C, 2016 1.2 °C, 2013
Minimum Humidity 84% 14:40 74% 86%, 2024 49%, 2014
Maximum Humidity 93% 07:15 93% 98%, 2010 63%, 2013
Mean Humidity 89% 85% 92%, 2010 55%, 2013
Minimum Pressure 1012 hPa 15:57 1010 hPa 1030 hPa, 2009 991 hPa, 2010
Maximum Pressure 1016 hPa 00:55 1015 hPa 1033 hPa, 2009 998 hPa, 2010
Mean Pressure 1014 hPa 1013 hPa 1032 hPa, 2009 994 hPa, 2010
Mean Wind Speed 4.6 mph (-0.5) 6.3 mph (+1.2) 12.4 mph, 2016 2.7 mph, 2010
Maximum Wind Speed 9.4 mph 14.4 mph 30.5 mph, 2022 9.4 mph, 2011
Maximum Gust 13.5 mph 14:57 20.7 mph 44.5 mph, 2022 13.5 mph, 2010
Mean Wind Direction E
Rainfall trace 32.2 mm (95%) 6, 2024
Maximum Hourly Rain n/a 1.9, 2010
Maximum 10-min Rain n/a 0.8, 2010
Maximum Rain Rate n/a 16, 2010
Minimum Dew Point 2.4 °C 03:20 2.6 °C 9.1 °C, 2016 -8.4 °C, 2013
Maximum Dew Point 4.1 °C 14:04 6.9 °C 11.0 °C, 2016 -4.5 °C, 2013
Mean Dew Point 3.3 °C 4.9 °C 9.9 °C, 2016 -6.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.6 °C 00:15 5.4 °C 11.4 °C, 2016 -1.2 °C, 2010
Day Maximum (09-21) 6.4 °C 14:25 9.3 °C 14.5 °C, 2016 1.7 °C, 2013
Max 10m Temp Rise 0.2 °C 12:29 0.3 °C 0.9 °C, 2009 0.1 °C, 2013
Max 1hr Temp Rise 0.5 °C 13:21 1.0 °C 2.3 °C, 2009 0.2 °C, 2013
Max 1hr Hum Rise 3% 22:55 4% 10%, 2022 2%, 2017
Max 10m Temp Fall 0.1 °C 15:02 0.2 °C 0.9 °C, 2009 0.1 °C, 2011
Max 1hr Temp Fall 0.4 °C 18:26 0.8 °C 2.0 °C, 2009 0.4 °C, 2011
Max 1hr Hum Fall 2% 09:10 6% 15%, 2015 2%, 2011
Max 10m Wind Speed 6.6 mph 12:08 10.1 mph 22.8 mph, 2022 6.6 mph, 2011
Minimum Feels-like 0.5 °C 04:54 1.8 °C 12.3 °C, 2016 -6.1 °C, 2013
Maximum Feels-like 6.4 °C 14:25 9.4 °C 16.2 °C, 2016 0.2 °C, 2013
Mean Feels-like 3.1 °C 5.9 °C 14.0 °C, 2016 -3.2 °C, 2013
Air-frost Hrs 0 hrs 0.2 hrs 5 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.8 °C (-2.7) 4.2 °C (-0.9) 9.6 °C (+4.1), 2009 1.3 °C (-4.2), 2013
Humidity Range 9% 18% 40%, 2014 6%, 2023
Pressure Range 4 hPa 5 hPa 23 hPa, 2024 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]29 hrs (50%) [16%] 8.6 [93%], 2009 0 [0%], 2011
Wet Hours 135 hrs (91%) [7%] 8, 2024 , 2009
Cloud Cover Overcast
Events None
Comments 22-00 broken Light Drizzle
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 21st 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