Daily Report for 1st January 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.9 °C (+4.7) 23:58 7.9 °C (+4.7) 12.9 °C (+9.7), 2022 -1.7 °C (-4.9), 2010
Maximum Temperature 12.5 °C (+4.7) 12:24 12.5 °C (+4.7) 15.3 °C (+7.5), 2022 2.4 °C (-5.4), 2010
Mean Temperature 11.1 °C (+4.7) 11.1 °C (+4.7) 13.5 °C, 2022 -0.0 °C, 2010
Minimum Humidity 80% 13:46 80% 90%, 2021 60%, 2009
Maximum Humidity 94% 05:00 94% 97%, 2014 83%, 2009
Mean Humidity 90% 90% 93%, 2021 72%, 2009
Minimum Pressure 1000 hPa 18:19 1000 hPa 1034 hPa, 2019 984 hPa, 2014
Maximum Pressure 1008 hPa 01:49 1008 hPa 1041 hPa, 2019 1002 hPa, 2014
Mean Pressure 1004 hPa 1004 hPa 1036 hPa, 2019 992 hPa, 2014
Mean Wind Speed 6.4 mph (+1.2) 6.4 mph (+1.2) 9.8 mph, 2014 1.9 mph, 2021
Maximum Wind Speed 13.7 mph 13.7 mph 25.1 mph, 2014 5.8 mph, 2021
Maximum Gust 17.6 mph 10:53 17.6 mph 35.5 mph, 2014 10.0 mph, 2009
Mean Wind Direction SW
Rainfall 7.8 mm 7.8 mm (409%) 7.9 mm, 2014
Maximum Hourly Rain 4.4 mm 15:21 4.4 mm, 2012
Maximum 10-min Rain 1.3 mm 14:37 1.3 mm, 2012
Maximum Rain Rate 10 mm/h 14:45 30 mm/h, 2023
Minimum Dew Point 6.0 °C 23:56 6.0 °C 10.0 °C, 2022 -3.4 °C, 2010
Maximum Dew Point 11.2 °C 01:41 11.2 °C 12.0 °C, 2022 -0.9 °C, 2010
Mean Dew Point 9.5 °C 9.5 °C 11.2 °C, 2022 -2.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 11.4 °C * 08:30 11.4 °C 12.8 °C, 2022 -1.2 °C, 2010
Day Maximum (09-21) 12.5 °C 12:21 12.5 °C 15.3 °C, 2022 2.4 °C, 2010
Max 10m Temp Rise 0.2 °C 10:53 0.2 °C 0.4 °C, 2016 0.2 °C, 2011
Max 1hr Temp Rise 0.7 °C 11:02 0.7 °C 1.7 °C, 2016 0.6 °C, 2023
Max 1hr Hum Rise 7% 15:02 7% 8%, 2014 3%, 2011
Max 10m Temp Fall 0.3 °C 14:18 0.3 °C 1.6 °C, 2017 0.1 °C, 2015
Max 1hr Temp Fall 1.3 °C 15:08 1.3 °C 3.8 °C, 2017 0.0 °C, 2015
Max 1hr Hum Fall 5% 11:24 5% 13%, 2019 2%, 2015
Max 10m Wind Speed 9.0 mph 12:20 9.0 mph 16.2 mph, 2014 4.5 mph, 2020
Minimum Feels-like 5.1 °C 22:52 5.1 °C 14.3 °C, 2022 -6.3 °C, 2010
Maximum Feels-like 14.2 °C 01:32 14.2 °C 17.1 °C, 2022 2.4 °C, 2010
Mean Feels-like 11.8 °C 11.8 °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 4.6 °C (+0.0) 4.6 °C (-0.0) 7.5 °C (+2.9), 2016 2.3 °C (-2.3), 2018
Humidity Range 14% 14% 27%, 2013 5%, 2021
Pressure Range 8 hPa 8 hPa 19 hPa, 2013 1 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]0.1 hrs (5%) [1.4%] 7 [99%], 2010 0 [0%], 2009
Wet Hours 3
[Mean rain rate: 2.6 mm/h]		3 hrs (139%) [13%] 9, 2017 , 2009
Cloud Cover Overcast
Events None
Comments 14-1630 Moderate Rain, 19 Showers
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 1st January 2012.
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

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Wind rose