Daily Report for 18th January 2012

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.3 °C (+2.3) 00:47 4.3 °C (+1.2) 7.6 °C (+4.6), 2014 -4.3 °C (-7.3), 2024
Maximum Temperature 11.9 °C (+4.1) 18:26 9.4 °C (+1.6) 11.9 °C (+4.1), 2012 1.8 °C (-6.0), 2013
Mean Temperature 9.3 °C (+3.2) 6.8 °C (+1.4) 9.3 °C, 2012 -1.4 °C, 2024
Minimum Humidity 87% 00:06 67% 95%, 2010 50%, 2009
Maximum Humidity 97% 09:45 91% 98%, 2010 82%, 2017
Mean Humidity 94% 80% 98%, 2010 70%, 2017
Minimum Pressure 1022 hPa 16:37 1018 hPa 1036 hPa, 2017 989 hPa, 2014
Maximum Pressure 1026 hPa 01:23 1025 hPa 1040 hPa, 2022 993 hPa, 2014
Mean Pressure 1024 hPa 1022 hPa 1038 hPa, 2017 990 hPa, 2014
Mean Wind Speed 6.1 mph (+0.9) 5.6 mph (+0.4) 10.4 mph, 2018 0.2 mph, 2017
Maximum Wind Speed 12.3 mph 14.1 mph 31.0 mph, 2018 3.8 mph, 2017
Maximum Gust 17.6 mph 10:59 19.9 mph 47.2 mph, 2018 5.2 mph, 2017
Mean Wind Direction SW
Rainfall 0.6 mm 27.1 mm (79%) 7.6 mm, 2011
Maximum Hourly Rain 0.3 mm 06:47 3.0 mm, 2009
Maximum 10-min Rain n/a 06:47 1.1, 2011
Maximum Rain Rate n/a 09:34 10, 2011
Minimum Dew Point 3.3 °C 00:07 0.7 °C 4.8 °C, 2014 -7.5 °C, 2024
Maximum Dew Point 11.1 °C 17:22 6.6 °C 11.1 °C, 2012 -2.3 °C, 2013
Mean Dew Point 8.4 °C 3.5 °C 8.4 °C, 2012 -5.0 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.1 °C * 21:00 4.9 °C 6.8 °C, 2014 -4.3 °C, 2024
Day Maximum (09-21) 11.9 °C 18:25 9.2 °C 11.9 °C, 2012 -0.8 °C, 2013
Max 10m Temp Rise 0.2 °C 12:02 0.3 °C 0.9 °C, 2019 0.1 °C, 2013
Max 1hr Temp Rise 0.7 °C 12:49 1.2 °C 3.8 °C, 2019 0.4 °C, 2013
Max 1hr Hum Rise 3% 01:35 6% 6%, 2013 2%, 2010
Max 10m Temp Fall 0.1 °C 19:49 0.4 °C 0.4 °C, 2017 0.1 °C, 2012
Max 1hr Temp Fall 0.3 °C 20:48 1.2 °C 1.8 °C, 2018 0.3 °C, 2012
Max 1hr Hum Fall 1% 10:33 9% 15%, 2018 0%, 2010
Max 10m Wind Speed 8.8 mph 09:44 9.4 mph 23.3 mph, 2018 2.7 mph, 2017
Minimum Feels-like 2.3 °C 01:00 1.5 °C 4.7 °C, 2014 -10.2 °C, 2024
Maximum Feels-like 13.7 °C 18:06 9.5 °C 13.7 °C, 2012 -0.4 °C, 2013
Mean Feels-like 8.9 °C 5.6 °C 8.9 °C, 2012 -5.3 °C, 2013
Air-frost Hrs 0 hrs 1 hrs 18 hrs, 2013 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.6 °C (+1.8) 5.2 °C (+0.4) 8.3 °C (+3.5), 2019 2.2 °C (-2.6), 2025
Humidity Range 10% 23% 44%, 2009 3%, 2010
Pressure Range 4 hPa 7 hPa 21 hPa, 2024 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]58 hrs (149%) [44%] 7.6 [101%], 2020 0 [0%], 2012
Wet Hours 2
[Mean rain rate: 0.3 mm/h]		21 hrs (53%) [4.7%] 10, 2013 , 2009
Cloud Cover Overcast
Events None
Comments 05-10 broken Light Rain/Drizzle
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 18th 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

daycamsumdaycamsum2

Wind rose