Daily Report for 18th February 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.2 °C (+3.4) 23:52 4.2 °C (+1.3) 9.4 °C (+6.6), 2023 -0.8 °C (-3.6), 2010
Maximum Temperature 11.3 °C (+3.1) 16:47 8.3 °C (+0.3) 14.9 °C (+6.7), 2024 4.8 °C (-3.4), 2010
Mean Temperature 8.1 °C (+3.2) 6.2 °C (+0.8) 11.7 °C, 2024 2.1 °C, 2010
Minimum Humidity 67% 18:48 71% 88%, 2010 51%, 2016
Maximum Humidity 84% 06:59 85% 98%, 2010 81%, 2015
Mean Humidity 78% 80% 96%, 2010 71%, 2015
Minimum Pressure 1022 hPa 20:38 1013 hPa 1031 hPa, 2015 986 hPa, 2010
Maximum Pressure 1027 hPa 09:17 1020 hPa 1042 hPa, 2015 992 hPa, 2010
Mean Pressure 1024 hPa 1016 hPa 1036 hPa, 2015 989 hPa, 2010
Mean Wind Speed 4.3 mph (-0.8) 4.2 mph (-0.9) 15.0 mph, 2022 1.7 mph, 2009
Maximum Wind Speed 8.8 mph 03:31 10.6 mph 44.1 mph, 2022 8.8 mph, 2017
Maximum Gust 12.6 mph 02:00 16.3 mph 63.9 mph, 2022 10.0 mph, 2009
Mean Wind Direction SW
Rainfall 0.0 mm 17.3 mm (60%) 11.6 mm, 2024
Maximum Hourly Rain n/a 4.3, 2014
Maximum 10-min Rain n/a 2.1, 2014
Maximum Rain Rate n/a 60, 2014
Minimum Dew Point 2.2 °C 22:58 0.9 °C 7.5 °C, 2024 -4.9 °C, 2016
Maximum Dew Point 6.7 °C 14:55 4.8 °C 12.2 °C, 2024 0.2 °C, 2025
Mean Dew Point 4.4 °C 2.9 °C 10.1 °C, 2024 -1.5 °C, 2025
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.4 °C * 01:07 4.5 °C 10.7 °C, 2023 -0.8 °C, 2010
Day Maximum (09-21) 11.3 °C 16:47 8.2 °C 14.9 °C, 2024 4.8 °C, 2010
Max 10m Temp Rise 0.2 °C 10:59 0.3 °C 1.3 °C, 2009 0.2 °C, 2017
Max 1hr Temp Rise 0.9 °C 10:59 1.1 °C 3.7 °C, 2018 0.5 °C, 2019
Max 1hr Hum Rise 4% 22:19 4% 16%, 2022 2%, 2010
Max 10m Temp Fall 0.3 °C 18:40 0.3 °C 1.7 °C, 2012 0.2 °C, 2010
Max 1hr Temp Fall 1.1 °C 19:28 0.9 °C 3.6 °C, 2012 0.7 °C, 2010
Max 1hr Hum Fall 5% 16:50 6% 13%, 2016 1%, 2010
Max 10m Wind Speed 6.9 mph 03:32 8.2 mph 29.5 mph, 2022 5.7 mph, 2010
Minimum Feels-like 2.9 °C 03:27 0.9 °C 7.5 °C, 2024 -4.0 °C, 2025
Maximum Feels-like 11.3 °C 16:46 8.2 °C 16.7 °C, 2024 4.8 °C, 2010
Mean Feels-like 6.6 °C 4.5 °C 13.0 °C, 2024 -0.2 °C, 2025
Air-frost Hrs 0 hrs 0 hrs 8 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.1 °C (-0.3) 4.1 °C (-1.0) 8.4 °C (+3.0), 2018 3.3 °C (-2.1), 2009
Humidity Range 17% 14% 41%, 2016 8%, 2019
Pressure Range 5 hPa 7 hPa 24 hPa, 2022 1 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2.5 [28%]27 hrs (55%) [17%] 9 [99%], 2015 0 [0%], 2019
Wet Hours 054 hrs (162%) [13%] 9, 2024 , 2009
Cloud Cover am: Overcast
pm: Mostly Cloudy transitioned to Sunny
Events None
Comments -
Extra Comments mysterious false tips removed
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 18th 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.
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Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose