Daily Report for 17th February 2020

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.3 °C (+2.5) 23:50 4.7 °C (+1.8) 10.9 °C (+8.1), 2023 -0.4 °C (-3.2), 2025
Maximum Temperature 10.5 °C (+2.3) 15:54 10.3 °C (+2.4) 14.3 °C (+6.2), 2023 5.6 °C (-2.6), 2025
Mean Temperature 7.6 °C (+2.4) 7.6 °C (+2.1) 12.3 °C, 2023 2.3 °C, 2025
Minimum Humidity 67% 16:01 69% 83%, 2024 47%, 2015
Maximum Humidity 82% 06:36 91% 98%, 2010 82%, 2020
Mean Humidity 76% 81% 89%, 2011 72%, 2016
Minimum Pressure 1006 hPa 00:16 1006 hPa 1027 hPa, 2024 989 hPa, 2010
Maximum Pressure 1019 hPa 23:55 1018 hPa 1041 hPa, 2015 992 hPa, 2010
Mean Pressure 1010 hPa 1012 hPa 1035 hPa, 2015 990 hPa, 2010
Mean Wind Speed 10.2 mph (+5.1) 8.6 mph (+3.5) 10.2 mph, 2020 1.8 mph, 2017
Maximum Wind Speed 19.8 mph 06:40 20.6 mph 19.8 mph, 2020 6.4 mph, 2017
Maximum Gust 39.2 mph 06:41 34.2 mph 44.5 mph, 2022 9.4 mph, 2017
Mean Wind Direction WSW
Rainfall 0.2 mm 52.6 mm (199%) 7.0 mm, 2016
Maximum Hourly Rain 0.2 mm 2.3 mm, 2016
Maximum 10-min Rain 0.2 mm 0.8 mm, 2022
Maximum Rain Rate n/a 30, 2022
Minimum Dew Point 1.9 °C 01:29 1.8 °C 8.9 °C, 2023 -3.5 °C, 2015
Maximum Dew Point 5.8 °C 14:26 7.3 °C 11.3 °C, 2024 -0.9 °C, 2025
Mean Dew Point 3.5 °C 4.5 °C 10.2 °C, 2023 -2.2 °C, 2025
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.4 °C * 00:18 5.5 °C 10.4 °C, 2023 -0.4 °C, 2025
Day Maximum (09-21) 10.5 °C 15:54 10.1 °C 14.3 °C, 2023 5.6 °C, 2025
Max 10m Temp Rise 0.4 °C 09:38 0.4 °C 0.7 °C, 2019 0.2 °C, 2021
Max 1hr Temp Rise 1.5 °C 10:05 1.4 °C 2.7 °C, 2018 0.7 °C, 2021
Max 1hr Hum Rise 6% 14:05 7% 13%, 2013 3%, 2011
Max 10m Temp Fall 0.3 °C 06:45 0.5 °C 0.6 °C, 2022 0.2 °C, 2011
Max 1hr Temp Fall 1.0 °C 17:01 1.4 °C 2.3 °C, 2015 0.7 °C, 2009
Max 1hr Hum Fall 7% 15:14 9% 21%, 2013 4%, 2009
Max 10m Wind Speed 16.1 mph 06:46 15.3 mph 16.1 mph, 2020 4.1 mph, 2017
Minimum Feels-like -0.2 °C 01:28 0.2 °C 11.9 °C, 2023 -4.0 °C, 2025
Maximum Feels-like 10.5 °C 15:50 10.3 °C 16.1 °C, 2023 3.2 °C, 2025
Mean Feels-like 3.9 °C 5.6 °C 13.7 °C, 2023 -0.7 °C, 2025
Air-frost Hrs 0 hrs 0 hrs 0.4 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.2 °C (-0.2) 5.6 °C (+0.6) 9.9 °C (+4.5), 2019 2.9 °C (-2.5), 2024
Humidity Range 15% 22% 43%, 2013 10%, 2021
Pressure Range 13 hPa 12 hPa 18 hPa, 2015 2 hPa, 2025
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [39%]60 hrs (131%) [41%] 9 [100%], 2015 0 [0%], 2021
Wet Hours 0.345 hrs (146%) [11%] 7, 2016 , 2009
Cloud Cover am: Sunny transitioned to Mostly Cloudy
pm: Partly Cloudy
Events None
Comments 0630 possible brief Shower
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 5.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 17th February 2020.
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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose