Daily Report for 15th February 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.9 °C (+2.2) 06:17 5.7 °C (+2.8) 12.2 °C (+9.4), 2024 -1.7 °C (-4.5), 2010
Maximum Temperature 6.8 °C (-1.3) 20:10 10.1 °C (+2.2) 16.9 °C (+8.8), 2024 3.4 °C (-4.7), 2010
Mean Temperature 6.1 °C (+0.4) 8.2 °C (+2.5) 13.7 °C, 2024 1.3 °C, 2010
Minimum Humidity 77% 11:45 72% 84%, 2022 52%, 2013
Maximum Humidity 92% 20:00 92% 97%, 2010 79%, 2014
Mean Humidity 86% 83% 90%, 2020 66%, 2014
Minimum Pressure 989 hPa 16:13 1011 hPa 1026 hPa, 2009 977 hPa, 2014
Maximum Pressure 998 hPa 00:03 1017 hPa 1034 hPa, 2016 998 hPa, 2011
Mean Pressure 994 hPa 1014 hPa 1028 hPa, 2009 988 hPa, 2014
Mean Wind Speed 5.9 mph (+0.8) 7.0 mph (+1.9) 13.3 mph, 2014 2.2 mph, 2010
Maximum Wind Speed 14.0 mph 15.9 mph 32.4 mph, 2014 7.4 mph, 2010
Maximum Gust 22.1 mph 12:41 23.1 mph 47.8 mph, 2014 10.9 mph, 2010
Mean Wind Direction SSE
Rainfall 2.2 mm 20.9 mm (87%) 6.2 mm, 2022
Maximum Hourly Rain 0.8 mm 18:59 2.2 mm, 2022
Maximum 10-min Rain 0.5 mm 13:51 1.4 mm, 2022
Maximum Rain Rate 3.0 mm/h 13:51 30 mm/h, 2022
Minimum Dew Point 2.0 °C 00:06 2.9 °C 10.0 °C, 2024 -4.6 °C, 2009
Maximum Dew Point 5.9 °C 20:01 7.7 °C 12.5 °C, 2024 0.1 °C, 2016
Mean Dew Point 3.9 °C 5.4 °C 11.3 °C, 2024 -1.4 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.9 °C 06:15 6.1 °C 12.3 °C, 2024 -1.7 °C, 2010
Day Maximum (09-21) 6.8 °C 12:00 10.1 °C 16.9 °C, 2024 3.0 °C, 2010
Max 10m Temp Rise 0.2 °C 08:01 0.3 °C 0.9 °C, 2019 0.2 °C, 2011
Max 1hr Temp Rise 0.6 °C 08:51 1.0 °C 3.5 °C, 2019 0.5 °C, 2020
Max 1hr Hum Rise 4% 13:45 5% 13%, 2009 3%, 2017
Max 10m Temp Fall 0.2 °C 05:05 0.2 °C 1.2 °C, 2018 0.2 °C, 2010
Max 1hr Temp Fall 0.7 °C 23:48 0.8 °C 2.1 °C, 2015 0.6 °C, 2012
Max 1hr Hum Fall 6% 11:10 7% 18%, 2018 2%, 2022
Max 10m Wind Speed 9.6 mph 12:44 11.1 mph 23.1 mph, 2014 5.2 mph, 2010
Minimum Feels-like 1.1 °C 08:24 2.6 °C 13.6 °C, 2024 -4.2 °C, 2016
Maximum Feels-like 7.1 °C 19:25 10.4 °C 19.3 °C, 2024 2.4 °C, 2016
Mean Feels-like 3.7 °C 6.9 °C 15.7 °C, 2024 -1.1 °C, 2016
Air-frost Hrs 0 hrs 0.3 hrs 6 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 1.9 °C (-3.4) 4.4 °C (-0.6) 13.0 °C (+7.7), 2019 1.9 °C (-3.4), 2011
Humidity Range 15% 19% 44%, 2018 8%, 2017
Pressure Range 9 hPa 5 hPa 25 hPa, 2014 4 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]25 hrs (63%) [20%] 9 [101%], 2019 0 [0%], 2009
Wet Hours 3
[Mean rain rate: 0.7 mm/h]		25 hrs (91%) [7%] 8, 2020 , 2009
Cloud Cover Overcast
Events None
Comments 02, 12-20 Light-Moderate Showers
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 15th 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.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose