Daily Report for 1st January 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.2 °C (+1.0) 23:52 4.2 °C (+1.0) 12.9 °C (+9.7), 2022 -1.7 °C (-4.9), 2010
Maximum Temperature 10.3 °C (+2.5) 13:12 10.3 °C (+2.5) 15.3 °C (+7.5), 2022 2.4 °C (-5.4), 2010
Mean Temperature 8.0 °C (+1.7) 8.0 °C (+1.7) 13.5 °C, 2022 -0.0 °C, 2010
Minimum Humidity 73% 16:42 73% 90%, 2021 60%, 2009
Maximum Humidity 86% 16:11 86% 97%, 2014 83%, 2009
Mean Humidity 81% 81% 93%, 2021 72%, 2009
Minimum Pressure 1034 hPa 05:30 1034 hPa 1034 hPa, 2019 984 hPa, 2014
Maximum Pressure 1041 hPa 23:50 1041 hPa 1041 hPa, 2019 1002 hPa, 2014
Mean Pressure 1036 hPa 1036 hPa 1036 hPa, 2019 992 hPa, 2014
Mean Wind Speed 4.1 mph (-1.1) 4.1 mph (-1.1) 11.1 mph, 2025 1.9 mph, 2021
Maximum Wind Speed 11.8 mph 12:55 11.8 mph 26.8 mph, 2025 5.8 mph, 2021
Maximum Gust 17.3 mph 13:26 17.3 mph 44.9 mph, 2025 10.0 mph, 2009
Mean Wind Direction NW
Rainfall 0.0 mm 0.0 mm (0%) 12.5 mm, 2025
Maximum Hourly Rain n/a 4.6, 2025
Maximum 10-min Rain n/a 1.9, 2025
Maximum Rain Rate n/a 54, 2025
Minimum Dew Point 0.8 °C 23:34 0.8 °C 10.0 °C, 2022 -3.4 °C, 2010
Maximum Dew Point 7.7 °C 13:41 7.7 °C 12.0 °C, 2022 -0.9 °C, 2010
Mean Dew Point 4.9 °C 4.9 °C 11.2 °C, 2022 -2.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.8 °C * 07:41 6.8 °C 12.8 °C, 2022 -1.2 °C, 2010
Day Maximum (09-21) 10.3 °C 13:11 10.3 °C 15.3 °C, 2022 2.4 °C, 2010
Max 10m Temp Rise 0.3 °C 10:12 0.3 °C 0.4 °C, 2016 0.2 °C, 2011
Max 1hr Temp Rise 1.3 °C 10:53 1.3 °C 1.7 °C, 2016 0.5 °C, 2025
Max 1hr Hum Rise 5% 17:42 5% 8%, 2014 3%, 2011
Max 10m Temp Fall 0.3 °C 22:12 0.3 °C 1.6 °C, 2017 0.1 °C, 2015
Max 1hr Temp Fall 1.3 °C 22:55 1.3 °C 4.5 °C, 2025 0.0 °C, 2015
Max 1hr Hum Fall 13% 16:52 13% 13%, 2019 2%, 2015
Max 10m Wind Speed 8.1 mph 13:31 8.1 mph 20.7 mph, 2025 4.5 mph, 2020
Minimum Feels-like 0.2 °C 23:49 0.2 °C 14.3 °C, 2022 -6.3 °C, 2010
Maximum Feels-like 10.6 °C 13:20 10.6 °C 17.1 °C, 2022 2.4 °C, 2010
Mean Feels-like 6.5 °C 6.5 °C 15.4 °C, 2022 -2.7 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 12 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.1 °C (+1.5) 6.1 °C (+1.5) 7.5 °C (+2.9), 2016 2.3 °C (-2.3), 2018
Humidity Range 13% 13% 27%, 2013 5%, 2021
Pressure Range 7 hPa 7 hPa 19 hPa, 2013 1 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [14%]1 hrs (48%) [14%] 7 [99%], 2010 0 [0%], 2009
Wet Hours 00 hrs (0%) [0%] 9, 2017 , 2009
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments -
Extra Comments some fireworks visible on skycam
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath n/a
Notes
Detailed daily weather report for Hampstead nw3 in London on 1st January 2019.
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

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Webcam Summary of Cloud Conditions

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose