Daily Report for 5th January 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.8 °C (-1.3) 23:54 4.8 °C (+1.6) 9.6 °C (+6.4), 2023 -4.2 °C (-7.3), 2010
Maximum Temperature 8.3 °C (+0.5) 12:09 10.3 °C (+2.5) 13.2 °C (+5.4), 2023 1.0 °C (-6.8), 2010
Mean Temperature 6.1 °C (-0.4) 7.3 °C (+2.0) 11.3 °C, 2023 -1.5 °C, 2010
Minimum Humidity 70% 12:37 71% 89%, 2016 46%, 2009
Maximum Humidity 93% 02:49 93% 98%, 2014 81%, 2017
Mean Humidity 84% 82% 93%, 2014 66%, 2009
Minimum Pressure 992 hPa 11:16 991 hPa 1038 hPa, 2019 982 hPa, 2016
Maximum Pressure 1000 hPa 23:30 1005 hPa 1041 hPa, 2019 989 hPa, 2016
Mean Pressure 994 hPa 998 hPa 1039 hPa, 2019 984 hPa, 2016
Mean Wind Speed 5.7 mph (+0.5) 8.1 mph (+2.9) 11.1 mph, 2012 0.8 mph, 2017
Maximum Wind Speed 18.5 mph 14:02 23.0 mph 25.5 mph, 2012 5.1 mph, 2017
Maximum Gust 30.0 mph 13:09 39.3 mph 44.0 mph, 2012 7.3 mph, 2017
Mean Wind Direction SW
Rainfall 0.0 mm 25.5 mm (268%) 4.6 mm, 2012
Maximum Hourly Rain n/a 2.4, 2014
Maximum 10-min Rain n/a 1.4, 2012
Maximum Rain Rate n/a 20, 2012
Minimum Dew Point 0.4 °C 23:44 2.1 °C 7.7 °C, 2023 -5.2 °C, 2010
Maximum Dew Point 5.4 °C 08:24 8.2 °C 11.7 °C, 2014 -1.0 °C, 2010
Mean Dew Point 3.5 °C 4.5 °C 9.1 °C, 2023 -3.3 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.4 °C * 01:06 5.6 °C 9.6 °C, 2023 -4.2 °C, 2010
Day Maximum (09-21) 8.3 °C 12:09 9.7 °C 13.2 °C, 2023 1.0 °C, 2010
Max 10m Temp Rise 0.3 °C 07:18 0.4 °C 0.6 °C, 2016 0.2 °C, 2013
Max 1hr Temp Rise 0.8 °C 08:04 1.2 °C 1.8 °C, 2010 0.5 °C, 2019
Max 1hr Hum Rise 5% 22:21 8% 11%, 2012 1%, 2015
Max 10m Temp Fall 0.4 °C 21:28 0.7 °C 0.9 °C, 2012 0.1 °C, 2014
Max 1hr Temp Fall 1.4 °C 21:55 1.5 °C 2.1 °C, 2012 0.3 °C, 2015
Max 1hr Hum Fall 9% 12:25 11% 16%, 2012 2%, 2016
Max 10m Wind Speed 15.8 mph 14:03 18.3 mph 17.1 mph, 2012 3.4 mph, 2017
Minimum Feels-like 0.2 °C 23:49 0.8 °C 7.0 °C, 2023 -8.9 °C, 2010
Maximum Feels-like 6.3 °C 05:14 10.5 °C 14.7 °C, 2023 1.0 °C, 2010
Mean Feels-like 3.7 °C 4.7 °C 11.9 °C, 2023 -3.6 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 13 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.5 °C (+1.8) 5.5 °C (+0.9) 10.0 °C (+5.3), 2014 2.0 °C (-2.7), 2020
Humidity Range 23% 22% 40%, 2009 5%, 2016
Pressure Range 8 hPa 14 hPa 21 hPa, 2012 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2.4 [34%]3.5 hrs (33%) [9.8%] 7.2 [101%], 2017 0 [0%], 2013
Wet Hours 014 hrs (130%) [12%] 2, 2010 , 2009
Cloud Cover Partly Cloudy
Events None
Comments -
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 5th January 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

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Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose