Daily Report for 12th February 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -5.7 °C (-8.5) 02:00 -3.3 °C (-6.3) 7.2 °C (+4.4), 2023 -5.7 °C (-8.5), 2012
Maximum Temperature 4.4 °C (-3.6) 15:34 2.0 °C (-5.9) 11.1 °C (+3.1), 2019 0.9 °C (-7.1), 2021
Mean Temperature 0.3 °C (-6.1) -0.5 °C (-6.1) 8.9 °C, 2011 -0.9 °C, 2021
Minimum Humidity 80% 00:09 64% 80%, 2012 57%, 2022
Maximum Humidity 95% 13:57 87% 98%, 2013 76%, 2015
Mean Humidity 88% 76% 88%, 2010 71%, 2021
Minimum Pressure 1032 hPa 07:35 1033 hPa 1037 hPa, 2023 985 hPa, 2014
Maximum Pressure 1036 hPa 11:57 1038 hPa 1039 hPa, 2023 1000 hPa, 2016
Mean Pressure 1034 hPa 1035 hPa 1038 hPa, 2023 993 hPa, 2014
Mean Wind Speed 1.0 mph (-4.1) 3.5 mph (-1.6) 10.2 mph, 2014 1.0 mph, 2012
Maximum Wind Speed 6.9 mph 10.8 mph 29.7 mph, 2014 6.9 mph, 2012
Maximum Gust 10.2 mph 13:03 15.0 mph 47.8 mph, 2014 10.2 mph, 2012
Mean Wind Direction NW
Rainfall trace 15.1 mm (81%) 6.7, 2014
Maximum Hourly Rain n/a 13:35 3.7, 2014
Maximum 10-min Rain n/a 13:35 1.2, 2014
Maximum Rain Rate n/a 13:36 9, 2014
Minimum Dew Point -8.5 °C 00:10 -7.5 °C 4.3 °C, 2023 -8.5 °C, 2012
Maximum Dew Point 3.3 °C 14:51 -1.5 °C 9.7 °C, 2011 -4.3 °C, 2021
Mean Dew Point -1.4 °C -4.3 °C 6.5 °C, 2011 -5.5 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -5.7 °C 01:00 -2.7 °C 8.7 °C, 2011 -5.7 °C, 2012
Day Maximum (09-21) 4.4 °C 15:34 2.0 °C 11.1 °C, 2019 0.9 °C, 2021
Max 10m Temp Rise 0.5 °C 03:38 0.4 °C 0.5 °C, 2009 0.1 °C, 2013
Max 1hr Temp Rise 1.9 °C 11:25 1.4 °C 2.1 °C, 2019 0.3 °C, 2013
Max 1hr Hum Rise 5% 13:06 5% 18%, 2009 1%, 2013
Max 10m Temp Fall 0.4 °C 22:57 0.3 °C 0.5 °C, 2009 0.1 °C, 2013
Max 1hr Temp Fall 1.7 °C 23:19 1.2 °C 1.8 °C, 2009 0.3 °C, 2013
Max 1hr Hum Fall 4% 15:09 8% 18%, 2014 3%, 2015
Max 10m Wind Speed 4.4 mph 15:05 7.5 mph 22.2 mph, 2014 4.4 mph, 2012
Minimum Feels-like -8.6 °C 04:17 -7.3 °C 4.3 °C, 2023 -10.4 °C, 2021
Maximum Feels-like 4.4 °C 15:19 1.5 °C 11.7 °C, 2011 -2.0 °C, 2021
Mean Feels-like -0.3 °C -2.4 °C 7.9 °C, 2011 -5.8 °C, 2021
Air-frost Hrs 10 hrs 12 hrs 20 hrs, 2021 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.1 °C (+4.9) 5.3 °C (+0.4) 10.1 °C (+4.9), 2012 1.1 °C (-4.1), 2015
Humidity Range 15% 23% 38%, 2009 5%, 2023
Pressure Range 4 hPa 5 hPa 18 hPa, 2014 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]43 hrs (135%) [42%] 8.4 [96%], 2024 0 [0%], 2012
Wet Hours 0.316 hrs (73%) [5.5%] 3.5, 2014 , 2009
Cloud Cover Overcast
Events Lying Snow (at 09z): ~3 cm
Air Frost
Comments Ly Snow to 3cm; possible 13, 22 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 12th February 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

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Webcam Summary of Cloud Conditions

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Wind rose