Daily Report for 11th February 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.4 °C (-2.5) 07:33 3.5 °C (+0.5) 8.4 °C (+5.5), 2011 -8.1 °C (-11.0), 2012
Maximum Temperature 2.4 °C (-5.6) 16:23 7.0 °C (-0.9) 12.0 °C (+4.0), 2011 0.3 °C (-7.7), 2021
Mean Temperature 1.4 °C (-4.0) 5.4 °C (-0.2) 10.1 °C, 2011 -3.7 °C, 2012
Minimum Humidity 78% 17:07 73% 98%, 2013 50%, 2020
Maximum Humidity 85% 04:37 86% 98%, 2013 77%, 2015
Mean Humidity 83% 80% 98%, 2013 67%, 2020
Minimum Pressure 1020 hPa 23:54 1007 hPa 1036 hPa, 2023 986 hPa, 2024
Maximum Pressure 1022 hPa 09:47 1015 hPa 1039 hPa, 2023 1000 hPa, 2024
Mean Pressure 1021 hPa 1011 hPa 1037 hPa, 2023 992 hPa, 2024
Mean Wind Speed 4.4 mph (-0.7) 4.1 mph (-1.0) 11.8 mph, 2020 0.8 mph, 2012
Maximum Wind Speed 10.3 mph 08:16 11.0 mph 28.6 mph, 2020 6.4 mph, 2012
Maximum Gust 14.7 mph 05:46 17.0 mph 39.2 mph, 2020 8.5 mph, 2012
Mean Wind Direction NNE
Rainfall / Snow-melt approx. 1.7 mm 15.2 mm (86%) 7.6 mm, 2013
Maximum Hourly Rain 0.4 mm 03:33 1.5 mm, 2018
Maximum 10-min Rain 0.4 mm 20:15 0.9 mm, 2018
Maximum Rain Rate 2.0 mm/h 20:15 13 mm/h, 2018
Minimum Dew Point -2.2 °C 07:47 0.3 °C 7.3 °C, 2011 -10.2 °C, 2012
Maximum Dew Point -0.1 °C 23:07 4.0 °C 11.0 °C, 2011 -3.8 °C, 2012
Mean Dew Point -1.2 °C 2.3 °C 9.1 °C, 2011 -7.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 0.4 °C 07:33 3.9 °C 8.4 °C, 2011 -8.1 °C, 2012
Day Maximum (09-21) 2.4 °C 16:23 6.9 °C 12.0 °C, 2011 0.3 °C, 2021
Max 10m Temp Rise 0.2 °C 14:10 0.3 °C 0.7 °C, 2012 0.1 °C, 2013
Max 1hr Temp Rise 0.6 °C 14:13 0.9 °C 2.6 °C, 2012 0.2 °C, 2013
Max 1hr Hum Rise 3% 18:12 3% 16%, 2018 0%, 2013
Max 10m Temp Fall 0.2 °C 17:33 0.3 °C 1.0 °C, 2018 0.1 °C, 2013
Max 1hr Temp Fall 0.5 °C 18:10 0.9 °C 2.2 °C, 2018 0.2 °C, 2013
Max 1hr Hum Fall 2% 14:33 5% 17%, 2014 0%, 2013
Max 10m Wind Speed 6.6 mph 05:55 8.6 mph 17.8 mph, 2020 5.0 mph, 2016
Minimum Feels-like -5.0 °C 08:10 0.4 °C 6.5 °C, 2011 -8.4 °C, 2012
Maximum Feels-like 1.7 °C 18:52 6.9 °C 13.7 °C, 2011 -0.4 °C, 2021
Mean Feels-like -1.9 °C 3.9 °C 10.3 °C, 2011 -4.5 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 23 hrs, 2021 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.0 °C (-3.1) 3.5 °C (-1.4) 8.9 °C (+3.8), 2012 0.8 °C (-4.3), 2013
Humidity Range 7% 13% 37%, 2018 0%, 2013
Pressure Range 2 hPa 8 hPa 22 hPa, 2019 1 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]9.6 hrs (33%) [10%] 8.7 [100%], 2012 0 [0%], 2013
Wet Hours 15
[Mean rain rate: 0.1 mm/h]		49 hrs (240%) [19%] 18, 2013 , 2009
Cloud Cover unknown
Events Snowfall: ~1 cm
Comments Rain/Snow throughout
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 11th February 2017.
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

daycamsumLarge resolution version

Wind rose