Daily Report for 4th February 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -5.1 °C (-8.1) 08:28 -3.6 °C (-6.6) 10.6 °C (+7.6), 2024 -5.1 °C (-8.1), 2012
Maximum Temperature 1.4 °C (-6.6) 13:22 1.4 °C (-6.4) 13.3 °C (+5.3), 2016 1.4 °C (-6.6), 2012
Mean Temperature -1.5 °C (-7.3) -1.1 °C (-6.5) 11.7 °C, 2024 -1.5 °C, 2012
Minimum Humidity 68% 17:34 51% 86%, 2021 47%, 2013
Maximum Humidity 92% 23:59 78% 98%, 2010 85%, 2011
Mean Humidity 76% 65% 93%, 2010 68%, 2013
Minimum Pressure 1024 hPa 23:44 1031 hPa 1037 hPa, 2023 987 hPa, 2014
Maximum Pressure 1039 hPa 05:44 1038 hPa 1041 hPa, 2023 998 hPa, 2009
Mean Pressure 1032 hPa 1035 hPa 1039 hPa, 2023 996 hPa, 2009
Mean Wind Speed 3.6 mph (-1.5) 6.0 mph (+0.9) 11.8 mph, 2011 1.7 mph, 2017
Maximum Wind Speed 12.8 mph 14.7 mph 25.5 mph, 2011 8.4 mph, 2021
Maximum Gust 21.9 mph 20:02 21.9 mph 35.6 mph, 2011 12.5 mph, 2021
Mean Wind Direction S
Rainfall / Snow-melt approx. 8.0 mm 8.0 mm (129%) 12.0 mm, 2021
Maximum Hourly Rain n/a 6.2, 2021
Maximum 10-min Rain n/a 2.4, 2022
Maximum Rain Rate n/a 22:00 30, 2022
Minimum Dew Point -8.7 °C 03:49 -9.6 °C 7.8 °C, 2024 -8.7 °C, 2012
Maximum Dew Point -0.7 °C 23:59 -4.5 °C 11.1 °C, 2024 -0.7 °C, 2012
Mean Dew Point -5.3 °C -7.2 °C 9.8 °C, 2024 -5.3 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -5.1 °C 08:26 -3.5 °C 10.9 °C, 2024 -5.1 °C, 2012
Day Maximum (09-21) 1.4 °C 13:21 1.4 °C 13.3 °C, 2016 1.4 °C, 2012
Max 10m Temp Rise 0.6 °C 09:10 0.5 °C 1.1 °C, 2009 0.2 °C, 2010
Max 1hr Temp Rise 2.7 °C 09:42 1.9 °C 2.7 °C, 2012 0.6 °C, 2011
Max 1hr Hum Rise 10% 19:19 7% 10%, 2009 2%, 2010
Max 10m Temp Fall 0.4 °C 01:22 0.3 °C 3.0 °C, 2022 0.1 °C, 2011
Max 1hr Temp Fall 1.2 °C 01:22 1.2 °C 6.1 °C, 2022 0.4 °C, 2011
Max 1hr Hum Fall 4% 12:13 12% 29%, 2013 3%, 2019
Max 10m Wind Speed 8.0 mph 19:38 10.4 mph 16.2 mph, 2011 6.0 mph, 2021
Minimum Feels-like -7.4 °C 20:03 -8.0 °C 10.9 °C, 2024 -7.4 °C, 2012
Maximum Feels-like 1.1 °C 12:34 -0.1 °C 15.1 °C, 2024 1.1 °C, 2012
Mean Feels-like -3.6 °C -4.4 °C 12.9 °C, 2024 -3.6 °C, 2012
Air-frost Hrs 15 hrs 16 hrs 15 hrs, 2012 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.5 °C (+1.5) 5.0 °C (+0.1) 9.1 °C (+4.1), 2016 2.1 °C (-2.9), 2010
Humidity Range 24% 27% 42%, 2013 12%, 2019
Pressure Range 15 hPa 7 hPa 21 hPa, 2020 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [42%]25 hrs (243%) [76%] 6.7 [81%], 2009 0 [0%], 2019
Wet Hours 5.5
[Mean rain rate: 1.5 mm/h]
5.5 hrs (77%) [5.7%] 8, 2019 , 2009
Cloud Cover am: Sunny transitioned to Partly Cloudy
pm: Mostly Cloudy transitioned to Overcast
Events Snowfall: ~8 cm
Air Frost
Comments 1830- Moderate-Heavy Snow
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 4th 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

day graph

Webcam Summary of Cloud Conditions

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Wind rose