Daily Report for 12th January 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.9 °C (+4.9) 00:18 4.3 °C (+1.2) 8.0 °C (+5.0), 2023 -3.7 °C (-6.7), 2025
Maximum Temperature 11.8 °C (+4.0) 11:58 10.4 °C (+2.5) 12.5 °C (+4.7), 2012 1.5 °C (-6.3), 2010
Mean Temperature 10.2 °C (+4.4) 7.6 °C (+1.9) 10.6 °C, 2023 0.0 °C, 2025
Minimum Humidity 68% 03:01 70% 89%, 2025 55%, 2013
Maximum Humidity 95% 21:03 93% 98%, 2010 87%, 2017
Mean Humidity 83% 83% 95%, 2025 75%, 2017
Minimum Pressure 1003 hPa 23:22 1016 hPa 1037 hPa, 2022 989 hPa, 2016
Maximum Pressure 1019 hPa 00:00 1028 hPa 1043 hPa, 2022 1006 hPa, 2023
Mean Pressure 1010 hPa 1022 hPa 1041 hPa, 2022 997 hPa, 2016
Mean Wind Speed 10.0 mph (+4.8) 7.2 mph (+2.0) 11.3 mph, 2023 0.3 mph, 2022
Maximum Wind Speed 22.5 mph 09:31 18.2 mph 25.8 mph, 2023 4.4 mph, 2025
Maximum Gust 30.6 mph 11:32 26.3 mph 36.9 mph, 2020 6.9 mph, 2025
Mean Wind Direction SW
Rainfall 9.2 mm 45.9 mm (201%) 15.9 mm, 2017
Maximum Hourly Rain 2.2 mm 23:17 4.6 mm, 2017
Maximum 10-min Rain 0.7 mm 22:28 1.0 mm, 2017
Maximum Rain Rate 3.6 mm/h 22:22 18 mm/h, 2017
Minimum Dew Point 3.2 °C 01:34 1.2 °C 4.4 °C, 2023 -4.5 °C, 2025
Maximum Dew Point 10.6 °C 23:50 8.8 °C 11.4 °C, 2011 0.7 °C, 2010
Mean Dew Point 7.4 °C 4.8 °C 8.5 °C, 2023 -0.8 °C, 2025
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.5 °C * 21:24 5.8 °C 9.3 °C, 2020 -3.7 °C, 2025
Day Maximum (09-21) 11.8 °C 11:58 9.5 °C 12.5 °C, 2012 1.5 °C, 2010
Max 10m Temp Rise 0.2 °C 01:21 0.3 °C 0.6 °C, 2014 0.1 °C, 2010
Max 1hr Temp Rise 1.0 °C 10:29 0.9 °C 2.7 °C, 2014 0.3 °C, 2024
Max 1hr Hum Rise 11% 06:49 6% 11%, 2015 2%, 2010
Max 10m Temp Fall 0.3 °C 06:40 0.3 °C 0.8 °C, 2017 0.1 °C, 2010
Max 1hr Temp Fall 0.7 °C 06:44 0.9 °C 3.1 °C, 2017 0.3 °C, 2010
Max 1hr Hum Fall 7% 08:16 9% 16%, 2013 2%, 2011
Max 10m Wind Speed 14.7 mph 09:34 13.1 mph 16.7 mph, 2023 2.3 mph, 2025
Minimum Feels-like 3.4 °C 00:05 0.6 °C 3.9 °C, 2019 -5.8 °C, 2025
Maximum Feels-like 13.0 °C 23:41 11.0 °C 14.0 °C, 2011 1.4 °C, 2010
Mean Feels-like 9.4 °C 6.0 °C 10.6 °C, 2023 -1.8 °C, 2010
Air-frost Hrs 0 hrs 0.3 hrs 11 hrs, 2025 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-0.9) 6.1 °C (+1.4) 10.2 °C (+5.4), 2014 1.1 °C (-3.7), 2010
Humidity Range 27% 22% 43%, 2013 8%, 2024
Pressure Range 16 hPa 11 hPa 22 hPa, 2017 4 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]19 hrs (74%) [22%] 6.5 [89%], 2022 0 [0%], 2009
Wet Hours 8
[Mean rain rate: 1.1 mm/h]		36 hrs (137%) [12%] 10, 2011 , 2009
Cloud Cover Overcast
Events None
Comments 15-19, 22-, occasional. other Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 12th January 2015.
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