Daily Report for 27th February 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -4.3 °C (-7.6) 23:13 0.6 °C (-2.3) 6.5 °C (+3.2), 2009 -4.3 °C (-7.6), 2018
Maximum Temperature -0.1 °C (-9.3) 14:09 6.2 °C (-2.1) 16.9 °C (+7.7), 2019 -0.1 °C (-9.3), 2018
Mean Temperature -2.4 °C (-8.4) 3.6 °C (-2.2) 10.2 °C, 2009 -2.4 °C, 2018
Minimum Humidity 59% 17:45 65% 76%, 2010 46%, 2022
Maximum Humidity 88% 07:09 91% 98%, 2013 74%, 2016
Mean Humidity 77% 80% 89%, 2010 61%, 2016
Minimum Pressure 1020 hPa 23:15 1013 hPa 1041 hPa, 2021 982 hPa, 2017
Maximum Pressure 1029 hPa 00:30 1021 hPa 1043 hPa, 2021 999 hPa, 2017
Mean Pressure 1024 hPa 1017 hPa 1042 hPa, 2021 989 hPa, 2017
Mean Wind Speed 4.8 mph (-0.3) 5.8 mph (+0.7) 7.6 mph, 2017 0.7 mph, 2021
Maximum Wind Speed 13.8 mph 14:19 14.4 mph 18.9 mph, 2017 6.4 mph, 2021
Maximum Gust 19.6 mph 14:20 22.2 mph 27.6 mph, 2020 9.1 mph, 2021
Mean Wind Direction NE
Rainfall / Snow-melt approx. 0.6 mm 33.4 mm (77%) 9.1 mm, 2017
Maximum Hourly Rain n/a 5.6, 2017
Maximum 10-min Rain n/a 2, 2017
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point -8.3 °C 17:45 -2.1 °C 3.7 °C, 2009 -8.3 °C, 2018
Maximum Dew Point -3.7 °C 14:09 2.8 °C 7.9 °C, 2010 -3.7 °C, 2018
Mean Dew Point -5.9 °C 0.3 °C 5.9 °C, 2012 -5.9 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * -4.1 °C * 07:05 1.3 °C 8.2 °C, 2017 -4.1 °C, 2018
Day Maximum (09-21) -0.1 °C 14:09 5.9 °C 16.9 °C, 2019 -0.1 °C, 2018
Max 10m Temp Rise 0.5 °C 09:57 0.5 °C 1.0 °C, 2019 0.3 °C, 2012
Max 1hr Temp Rise 1.6 °C 09:05 1.6 °C 4.3 °C, 2019 0.8 °C, 2017
Max 1hr Hum Rise 19% 12:24 9% 19%, 2018 4%, 2016
Max 10m Temp Fall 1.1 °C 14:27 0.5 °C 1.1 °C, 2018 0.2 °C, 2012
Max 1hr Temp Fall 1.8 °C 12:27 1.2 °C 2.5 °C, 2019 0.5 °C, 2012
Max 1hr Hum Fall 15% 16:15 9% 15%, 2014 4%, 2012
Max 10m Wind Speed 9.8 mph 11:33 11.2 mph 14.4 mph, 2017 4.5 mph, 2021
Minimum Feels-like -10.3 °C 08:05 -3.8 °C 3.2 °C, 2012 -10.3 °C, 2018
Maximum Feels-like -1.1 °C 15:24 4.8 °C 17.1 °C, 2019 -1.1 °C, 2018
Mean Feels-like -6.4 °C 0.4 °C 9.8 °C, 2019 -6.4 °C, 2018
Air-frost Hrs 24 hrs 3 hrs 24 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.2 °C (-1.8) 5.5 °C (+0.2) 14.7 °C (+8.7), 2019 3.2 °C (-2.8), 2016
Humidity Range 29% 26% 48%, 2014 11%, 2017
Pressure Range 9 hPa 8 hPa 20 hPa, 2020 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4.4 [46%]91 hrs (121%) [38%] 10 [104%], 2022 0 [0%], 2012
Wet Hours 1
[Mean rain rate: 0.6 mm/h]
53 hrs (105%) [8.1%] 8, 2020 , 2009
Cloud Cover am: Sunny transitioned to Mostly Cloudy
pm: Partly Cloudy
Events Snowfall: ~0.6 cm
Air Frost
Comments 11-15 Snow shs
Extra Comments no 09z snow, but did get a dusting at 13z
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 27th February 2018.
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