Daily Report for 26th December 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.3 °C (-0.1) 08:24 3.5 °C (-0.1) 14.0 °C (+10.6), 2015 -4.5 °C (-7.9), 2010
Maximum Temperature 7.8 °C (+0.0) 23:51 7.7 °C (-0.5) 14.9 °C (+7.1), 2015 2.5 °C (-5.3), 2010
Mean Temperature 5.6 °C (-0.0) 5.7 °C (-0.3) 14.4 °C, 2015 -1.2 °C, 2010
Minimum Humidity 76% 14:55 80% 94%, 2021 52%, 2016
Maximum Humidity 94% 21:33 93% 98%, 2009 82%, 2016
Mean Humidity 88% 88% 97%, 2013 68%, 2016
Minimum Pressure 979 hPa 23:30 1011 hPa 1031 hPa, 2011 979 hPa, 2017
Maximum Pressure 999 hPa 09:47 1022 hPa 1042 hPa, 2016 999 hPa, 2013
Mean Pressure 993 hPa 1017 hPa 1032 hPa, 2011 993 hPa, 2017
Mean Wind Speed 6.4 mph (+1.3) 5.5 mph (+0.4) 11.3 mph, 2015 1.8 mph, 2018
Maximum Wind Speed 13.5 mph 21:10 13.1 mph 24.7 mph, 2020 5.8 mph, 2018
Maximum Gust 20.7 mph 00:50 21.3 mph 39.3 mph, 2013 10.4 mph, 2018
Mean Wind Direction SSW
Rainfall 10.6 mm 72.6 mm (152%) 14.6 mm, 2021
Maximum Hourly Rain 3.7 mm 20:54 4.6 mm, 2021
Maximum 10-min Rain 0.9 mm 20:48 1.2 mm, 2021
Maximum Rain Rate 7 mm/h 20:42 18 mm/h, 2014
Minimum Dew Point 1.8 °C 08:56 1.6 °C 9.2 °C, 2015 -6.3 °C, 2010
Maximum Dew Point 6.9 °C 23:51 5.9 °C 12.4 °C, 2015 -0.8 °C, 2010
Mean Dew Point 3.8 °C 3.8 °C 10.5 °C, 2015 -3.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.3 °C 08:24 4.1 °C 14.1 °C, 2015 -4.5 °C, 2010
Day Maximum (09-21) * 7.3 °C * 15:25 7.5 °C 14.9 °C, 2015 1.3 °C, 2010
Max 10m Temp Rise 0.3 °C 10:49 0.3 °C 0.5 °C, 2010 0.1 °C, 2015
Max 1hr Temp Rise 1.3 °C 11:28 1.0 °C 1.7 °C, 2010 0.3 °C, 2015
Max 1hr Hum Rise 9% 16:03 5% 9%, 2017 1%, 2021
Max 10m Temp Fall 0.3 °C 00:12 0.4 °C 1.4 °C, 2022 0.2 °C, 2009
Max 1hr Temp Fall 0.6 °C 05:19 1.0 °C 3.3 °C, 2016 0.4 °C, 2015
Max 1hr Hum Fall 4% 11:14 5% 19%, 2013 1%, 2021
Max 10m Wind Speed 10.6 mph 01:04 10.2 mph 19.4 mph, 2020 4.5 mph, 2018
Minimum Feels-like -1.9 °C 09:05 -1.0 °C 14.9 °C, 2015 -9.4 °C, 2010
Maximum Feels-like 7.1 °C 23:45 7.3 °C 17.0 °C, 2015 2.0 °C, 2010
Mean Feels-like 2.3 °C 3.3 °C 15.9 °C, 2015 -2.4 °C, 2010
Air-frost Hrs 0 hrs 0.8 hrs 13 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.5 °C (+0.1) 4.2 °C (-0.4) 9.4 °C (+5.0), 2020 0.9 °C (-3.5), 2015
Humidity Range 18% 14% 30%, 2016 4%, 2021
Pressure Range 20 hPa 11 hPa 36 hPa, 2020 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [71%]52 hrs (96%) [28%] 6 [86%], 2022 0 [0%], 2014
Wet Hours 7
[Mean rain rate: 1.5 mm/h]
59 hrs (114%) [9.5%] 9, 2021 0, 2010
Cloud Cover am: Sunny
pm: Partly Cloudy transitioned to Overcast
Events None
Comments 00, Eve Rain
Extra Comments
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 26th December 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