Daily Report for 1st February 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -1.7 °C (-4.7) 02:15 -1.7 °C (-4.7) 9.5 °C (+6.5), 2016 -2.5 °C (-5.5), 2009
Maximum Temperature 6.9 °C (-1.0) 16:49 6.9 °C (-1.0) 13.9 °C (+6.0), 2016 1.9 °C (-6.0), 2019
Mean Temperature 3.5 °C (-2.8) 3.5 °C (-2.8) 12.2 °C, 2016 0.1 °C, 2009
Minimum Humidity 80% 00:00 80% 88%, 2019 43%, 2012
Maximum Humidity 95% 23:59 95% 98%, 2014 79%, 2012
Mean Humidity 86% 86% 93%, 2019 64%, 2009
Minimum Pressure 1024 hPa 10:14 1024 hPa 1029 hPa, 2012 982 hPa, 2014
Maximum Pressure 1028 hPa 22:14 1028 hPa 1036 hPa, 2024 996 hPa, 2014
Mean Pressure 1026 hPa 1026 hPa 1034 hPa, 2024 989 hPa, 2019
Mean Wind Speed 5.4 mph (+0.3) 5.4 mph (+0.3) 12.3 mph, 2016 1.6 mph, 2021
Maximum Wind Speed 12.3 mph 12.3 mph 25.3 mph, 2016 7.5 mph, 2021
Maximum Gust 17.3 mph 01:58 17.3 mph 38.0 mph, 2020 11.4 mph, 2021
Mean Wind Direction WSW
Rainfall trace 0.1 mm (6%) 13.2, 2019
Maximum Hourly Rain n/a 3.7, 2014
Maximum 10-min Rain n/a 2.4, 2014
Maximum Rain Rate n/a 48, 2014
Minimum Dew Point -4.7 °C 02:10 -4.7 °C 6.5 °C, 2017 -9.5 °C, 2009
Maximum Dew Point 5.5 °C 16:34 5.5 °C 10.0 °C, 2016 -3.0 °C, 2012
Mean Dew Point 1.5 °C 1.5 °C 8.2 °C, 2017 -6.0 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -1.7 °C 02:15 -1.7 °C 11.6 °C, 2016 -1.7 °C, 2011
Day Maximum (09-21) 6.9 °C 16:45 6.9 °C 13.9 °C, 2016 1.9 °C, 2019
Max 10m Temp Rise 0.3 °C 10:38 0.3 °C 0.4 °C, 2022 0.2 °C, 2016
Max 1hr Temp Rise 1.2 °C 10:47 1.2 °C 1.8 °C, 2022 0.6 °C, 2016
Max 1hr Hum Rise 5% 13:13 5% 20%, 2015 1%, 2017
Max 10m Temp Fall 0.2 °C 01:51 0.2 °C 1.0 °C, 2018 0.1 °C, 2017
Max 1hr Temp Fall 0.7 °C 01:51 0.7 °C 2.2 °C, 2014 0.4 °C, 2017
Max 1hr Hum Fall 2% 09:41 2% 15%, 2012 1%, 2017
Max 10m Wind Speed 9.0 mph 00:06 9.0 mph 18.8 mph, 2016 5.7 mph, 2021
Minimum Feels-like -8.0 °C 01:59 -8.0 °C 6.3 °C, 2017 -8.0 °C, 2011
Maximum Feels-like 6.9 °C 16:38 6.9 °C 14.7 °C, 2016 -0.5 °C, 2012
Mean Feels-like 0.9 °C 0.9 °C 12.6 °C, 2016 -4.5 °C, 2012
Air-frost Hrs 5 hrs 5 hrs 10 hrs, 2012 0 hrs, 2013
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.6 °C (+3.7) 8.6 °C (+3.7) 8.6 °C (+3.7), 2011 1.4 °C (-3.5), 2021
Humidity Range 15% 15% 41%, 2014 4%, 2017
Pressure Range 4 hPa 4 hPa 14 hPa, 2013 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.2 [2%]0.2 hrs (8%) [2.4%] 8 [98%], 2024 0 [0%], 2017
Wet Hours 0.50.5 hrs (27%) [2.1%] 20, 2019 , 2009
Cloud Cover am: Mostly Cloudy transitioned to Overcast
pm: Overcast
Events Air Frost
Comments Air frost; 1030, 1230 Light/Moderate Showers
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 1st 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