Daily Report for 12th February 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -1.5 °C (-4.3) 07:01 -1.2 °C (-4.1) 7.2 °C (+4.4), 2023 -5.7 °C (-8.5), 2012
Maximum Temperature 5.2 °C (-2.8) 13:29 3.9 °C (-4.0) 11.1 °C (+3.1), 2019 0.9 °C (-7.1), 2021
Mean Temperature 1.9 °C (-3.6) 1.4 °C (-4.0) 8.9 °C, 2011 -0.9 °C, 2021
Minimum Humidity 58% 13:14 70% 80%, 2012 57%, 2022
Maximum Humidity 96% 22:40 95% 98%, 2013 76%, 2015
Mean Humidity 77% 82% 88%, 2010 71%, 2021
Minimum Pressure 1021 hPa 23:53 995 hPa 1037 hPa, 2023 985 hPa, 2014
Maximum Pressure 1026 hPa 11:38 1005 hPa 1039 hPa, 2023 1000 hPa, 2016
Mean Pressure 1024 hPa 1000 hPa 1038 hPa, 2023 993 hPa, 2014
Mean Wind Speed 3.5 mph (-1.6) 4.5 mph (-0.6) 10.2 mph, 2014 1.0 mph, 2012
Maximum Wind Speed n/a 0.0 mph 29.7, 2014 6.9, 2012
Maximum Gust 19.0 mph 19.9 mph 47.8 mph, 2014 10.2 mph, 2012
Mean Wind Direction n/a
Rainfall / Snow-melt approx. 0.5 mm 58.5 mm (303%) 6.7 mm, 2014
Maximum Hourly Rain 0.3 mm 17:26 3.7 mm, 2014
Maximum 10-min Rain n/a 17:19 1.2, 2014
Maximum Rain Rate n/a 17:19 9, 2014
Minimum Dew Point -4.7 °C 07:22 -3.8 °C 4.3 °C, 2023 -8.5 °C, 2012
Maximum Dew Point 0.7 °C 23:54 1.2 °C 9.7 °C, 2011 -4.3 °C, 2021
Mean Dew Point -2.5 °C -1.0 °C 6.5 °C, 2011 -5.5 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -1.5 °C -1.0 °C 8.7 °C, 2011 -5.7 °C, 2012
Day Maximum (09-21) 5.2 °C 3.9 °C 11.1 °C, 2019 0.9 °C, 2021
Max 10m Temp Rise 0.5 °C 12:00 0.3 °C 0.5 °C, 2009 0.1 °C, 2013
Max 1hr Temp Rise 1.7 °C 12:31 0.7 °C 2.1 °C, 2019 0.3 °C, 2013
Max 1hr Hum Rise 18% 17:26 5% 18%, 2009 1%, 2013
Max 10m Temp Fall 0.5 °C 17:12 0.4 °C 0.5 °C, 2009 0.1 °C, 2013
Max 1hr Temp Fall 1.8 °C 17:36 0.8 °C 1.8 °C, 2009 0.3 °C, 2013
Max 1hr Hum Fall 9% 12:49 5% 18%, 2014 3%, 2015
Max 10m Wind Speed n/a 0.0 mph 22.2, 2014 4.4, 2012
Minimum Feels-like n/a 0.0 °C 4.3, 2023 -10.4, 2021
Maximum Feels-like n/a 0.0 °C 11.7, 2011 -2, 2021
Mean Feels-like n/a 0.0 °C 7.9, 2011 -5.8, 2021
Air-frost Hrs 9 hrs 5 hrs 20 hrs, 2021 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.7 °C (+1.5) 5.1 °C (+0.1) 10.1 °C (+4.9), 2012 1.1 °C (-4.1), 2015
Humidity Range 38% 25% 38%, 2009 5%, 2023
Pressure Range 5 hPa 10 hPa 18 hPa, 2014 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4.8 [55%]36 hrs (114%) [36%] 8.4 [96%], 2024 0 [0%], 2012
Wet Hours 0 hrs (0%) [0%] 3.5, 2014 , 2009
Cloud Cover not available
Events Snowfall: ~0.5 cm
Lying Snow (at 09z): trace amount
Air Frost
Comments 16-2100 Light/Moderate Snow Lying to <1cm
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 12th February 2009.
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

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose