Daily Report for 5th December 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.9 °C (-4.8) 03:40 -0.0 °C (-4.0) 11.4 °C (+7.5), 2015 -1.3 °C (-5.2), 2010
Maximum Temperature 3.0 °C (-5.8) 13:50 6.0 °C (-2.9) 13.7 °C (+4.8), 2024 3.0 °C (-5.8), 2012
Mean Temperature 1.3 °C (-5.3) 2.9 °C (-3.5) 12.1 °C, 2015 1.3 °C, 2012
Minimum Humidity 72% 17:50 69% 91%, 2023 52%, 2013
Maximum Humidity 97% 09:25 94% 98%, 2009 73%, 2015
Mean Humidity 84% 84% 94%, 2023 68%, 2015
Minimum Pressure 1002 hPa 02:11 1007 hPa 1033 hPa, 2017 985 hPa, 2020
Maximum Pressure 1016 hPa 23:52 1014 hPa 1036 hPa, 2017 1000 hPa, 2020
Mean Pressure 1008 hPa 1010 hPa 1035 hPa, 2017 993 hPa, 2020
Mean Wind Speed 4.1 mph (-1.0) 4.3 mph (-0.8) 13.5 mph, 2015 0.2 mph, 2016
Maximum Wind Speed 10.7 mph 12:38 10.9 mph 26.1 mph, 2015 4.2 mph, 2016
Maximum Gust 15.4 mph 12:38 15.4 mph 41.5 mph, 2024 6.3 mph, 2016
Mean Wind Direction NNW
Rainfall 0.3 mm 5.8 mm (63%) 13.4 mm, 2024
Maximum Hourly Rain 0.3 mm 07:17 4.6 mm, 2024
Maximum 10-min Rain 0.3 mm 07:17 2.7 mm, 2024
Maximum Rain Rate n/a 42, 2024
Minimum Dew Point -4.0 °C 23:53 -2.3 °C 6.3 °C, 2009 -4.0 °C, 2012
Maximum Dew Point 1.5 °C 10:26 3.6 °C 12.7 °C, 2024 1.5 °C, 2012
Mean Dew Point -1.3 °C 0.4 °C 10.3 °C, 2024 -1.3 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.9 °C 03:40 0.2 °C 11.4 °C, 2015 -0.9 °C, 2012
Day Maximum (09-21) 3.0 °C 13:50 6.0 °C 13.7 °C, 2024 3.0 °C, 2012
Max 10m Temp Rise 0.4 °C 04:21 0.4 °C 0.9 °C, 2018 0.1 °C, 2015
Max 1hr Temp Rise 1.3 °C 04:54 1.5 °C 2.6 °C, 2018 0.4 °C, 2015
Max 1hr Hum Rise 4% 04:20 5% 6%, 2011 2%, 2016
Max 10m Temp Fall 0.3 °C 01:20 0.4 °C 1.3 °C, 2013 0.1 °C, 2015
Max 1hr Temp Fall 0.9 °C 02:09 1.2 °C 2.3 °C, 2013 0.2 °C, 2015
Max 1hr Hum Fall 11% 12:35 14% 19%, 2013 2%, 2023
Max 10m Wind Speed 8.6 mph 12:47 8.3 mph 20.3 mph, 2015 2.2 mph, 2016
Minimum Feels-like -4.4 °C 22:51 -3.6 °C 11.4 °C, 2015 -4.4 °C, 2012
Maximum Feels-like 1.4 °C 13:40 5.5 °C 16.2 °C, 2024 1.4 °C, 2012
Mean Feels-like -1.3 °C 0.5 °C 12.5 °C, 2024 -1.3 °C, 2012
Air-frost Hrs 2 hrs 4 hrs 6 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-1.0) 6.0 °C (+1.0) 9.8 °C (+4.8), 2019 1.3 °C (-3.7), 2015
Humidity Range 25% 25% 38%, 2013 5%, 2023
Pressure Range 14 hPa 6 hPa 19 hPa, 2024 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [49%]16 hrs (153%) [46%] 5 [70%], 2016 0 [0%], 2015
Wet Hours 0.57.5 hrs (75%) [6.3%] 9, 2024 0, 2010
Cloud Cover am: Overcast transitioned to Partly Cloudy
pm: Partly Cloudy or Mostly Sunny
Events Air Frost
Comments 07 Shower (possible Sleety)
Extra Comments Snow reported from Shower in N London
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 5th December 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

daycamsum

Wind rose