Daily Report for 23rd February 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.2 °C (+2.2) 23:32 5.1 °C (+2.2) 9.9 °C (+6.9), 2012 -0.6 °C (-3.6), 2018
Maximum Temperature 11.1 °C (+2.4) 08:06 9.4 °C (+1.3) 16.0 °C (+7.3), 2012 1.7 °C (-7.0), 2013
Mean Temperature 9.4 °C (+2.3) 7.2 °C (+1.8) 12.9 °C, 2012 0.7 °C, 2013
Minimum Humidity 47% 15:09 70% 85%, 2025 47%, 2017
Maximum Humidity 86% 00:14 85% 98%, 2010 76%, 2013
Mean Humidity 67% 79% 94%, 2010 66%, 2013
Minimum Pressure 990 hPa 13:01 1012 hPa 1033 hPa, 2019 985 hPa, 2024
Maximum Pressure 1007 hPa 00:00 1019 hPa 1036 hPa, 2019 992 hPa, 2015
Mean Pressure 997 hPa 1015 hPa 1034 hPa, 2019 988 hPa, 2024
Mean Wind Speed 12.9 mph (+7.8) 4.9 mph (-0.2) 12.9 mph, 2017 2.1 mph, 2019
Maximum Wind Speed 27.4 mph 15:57 12.0 mph 27.4 mph, 2017 8.5 mph, 2019
Maximum Gust 46.1 mph 14:16 18.8 mph 46.1 mph, 2017 11.5 mph, 2019
Mean Wind Direction W
Rainfall 3.0 mm 21.0 mm (57%) 3.5 mm, 2011
Maximum Hourly Rain 2.6 mm 08:24 2.6 mm, 2017
Maximum 10-min Rain 2.6 mm 08:24 2.6 mm, 2017
Maximum Rain Rate 48 mm/h 08:23 48 mm/h, 2017
Minimum Dew Point -1.0 °C 16:09 1.8 °C 7.9 °C, 2012 -7.0 °C, 2013
Maximum Dew Point 8.7 °C 00:27 5.9 °C 11.5 °C, 2012 -2.9 °C, 2013
Mean Dew Point 3.3 °C 3.8 °C 10.2 °C, 2012 -5.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.7 °C * 08:54 5.5 °C 9.7 °C, 2017 -0.6 °C, 2018
Day Maximum (09-21) * 10.9 °C * 13:33 9.4 °C 16.0 °C, 2012 1.7 °C, 2013
Max 10m Temp Rise 0.3 °C 09:28 0.3 °C 1.1 °C, 2025 0.2 °C, 2010
Max 1hr Temp Rise 0.6 °C 13:26 1.1 °C 2.5 °C, 2022 0.6 °C, 2010
Max 1hr Hum Rise 6% 18:23 4% 11%, 2013 4%, 2010
Max 10m Temp Fall 0.8 °C 08:34 0.3 °C 1.1 °C, 2025 0.1 °C, 2011
Max 1hr Temp Fall 1.4 °C 08:52 0.9 °C 2.6 °C, 2019 0.4 °C, 2011
Max 1hr Hum Fall 12% 09:27 6% 18%, 2020 4%, 2011
Max 10m Wind Speed 22.0 mph 13:24 9.4 mph 22.0 mph, 2017 6.2 mph, 2019
Minimum Feels-like 0.6 °C 23:41 2.2 °C 7.1 °C, 2012 -5.6 °C, 2013
Maximum Feels-like 11.7 °C 00:27 9.6 °C 17.8 °C, 2012 -0.5 °C, 2013
Mean Feels-like 8.2 °C 6.0 °C 14.2 °C, 2012 -3.2 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 5 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.9 °C (+0.3) 4.4 °C (-0.8) 9.7 °C (+4.1), 2019 2.0 °C (-3.6), 2013
Humidity Range 39% 16% 40%, 2015 10%, 2025
Pressure Range 17 hPa 7 hPa 17 hPa, 2017 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [11%]32 hrs (50%) [16%] 8 [85%], 2021 0 [0%], 2010
Wet Hours 1
[Mean rain rate: 3.0 mm/h]		58 hrs (136%) [11%] 5, 2011 , 2009
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments am Showers
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 23rd 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