Daily Report for 5th December 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.4 °C (+3.5) 07:54 3.5 °C (-0.5) 11.4 °C (+7.5), 2015 -1.3 °C (-5.2), 2010
Maximum Temperature 11.6 °C (+2.7) 23:55 8.6 °C (-0.4) 12.7 °C (+3.8), 2015 3.0 °C (-5.9), 2012
Mean Temperature 9.3 °C (+3.1) 6.1 °C (-0.5) 12.1 °C, 2015 1.3 °C, 2012
Minimum Humidity 82% 13:13 79% 91%, 2023 52%, 2013
Maximum Humidity 98% 02:38 97% 98%, 2009 73%, 2015
Mean Humidity 93% 90% 94%, 2023 68%, 2015
Minimum Pressure 996 hPa 23:41 997 hPa 1033 hPa, 2017 985 hPa, 2020
Maximum Pressure 1001 hPa 08:08 1006 hPa 1036 hPa, 2017 1000 hPa, 2020
Mean Pressure 998 hPa 1001 hPa 1035 hPa, 2017 993 hPa, 2020
Mean Wind Speed 6.1 mph (+1.0) 4.5 mph (-0.6) 13.5 mph, 2015 0.2 mph, 2016
Maximum Wind Speed 10.4 mph 9.2 mph 26.1 mph, 2015 4.2 mph, 2016
Maximum Gust 15.0 mph 23:46 14.1 mph 37.3 mph, 2015 6.3 mph, 2016
Mean Wind Direction SW
Rainfall 5.5 mm 20.5 mm (223%) 5.5 mm, 2009
Maximum Hourly Rain 1.9 mm 02:41 1.9 mm, 2009
Maximum 10-min Rain n/a 02:41 1.5, 2013
Maximum Rain Rate n/a 02:40 36, 2013
Minimum Dew Point 6.3 °C 07:39 1.6 °C 6.3 °C, 2009 -4.0 °C, 2012
Maximum Dew Point 10.8 °C 23:48 7.6 °C 11.5 °C, 2018 1.5 °C, 2012
Mean Dew Point 8.2 °C 4.5 °C 8.8 °C, 2018 -1.3 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.4 °C 4.4 °C 11.4 °C, 2015 -0.9 °C, 2012
Day Maximum (09-21) 11.6 °C 8.2 °C 12.7 °C, 2015 3.0 °C, 2012
Max 10m Temp Rise n/a 23:26 0.5 °C 0.9, 2018 0.1, 2015
Max 1hr Temp Rise n/a 12:45 1.1 °C 2.6, 2018 0.4, 2015
Max 1hr Hum Rise n/a 18:06 5% 6, 2011 2, 2016
Max 10m Temp Fall n/a 23:06 0.4 °C 1.3, 2013 0.1, 2015
Max 1hr Temp Fall n/a 07:11 0.8 °C 2.3, 2013 0.2, 2015
Max 1hr Hum Fall n/a 23:06 7% 19, 2013 2, 2023
Max 10m Wind Speed 10.1 mph 23:31 7.9 mph 20.3 mph, 2015 2.2 mph, 2016
Minimum Feels-like 5.1 °C 09:36 0.5 °C 11.4 °C, 2015 -4.4 °C, 2012
Maximum Feels-like 13.3 °C 23:51 9.1 °C 14.3 °C, 2018 1.4 °C, 2012
Mean Feels-like 8.9 °C 5.4 °C 12.1 °C, 2015 -1.3 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 6 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.2 °C (-0.8) 5.2 °C (+0.1) 9.8 °C (+4.8), 2019 1.3 °C (-3.7), 2015
Humidity Range 16% 19% 38%, 2013 5%, 2023
Pressure Range 5 hPa 8 hPa 17 hPa, 2021 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [42%]14 hrs (130%) [39%] 5 [69%], 2016 0 [0%], 2015
Wet Hours 6
[Mean rain rate: 0.9 mm/h]
20 hrs (195%) [16%] 8, 2018 0, 2010
Cloud Cover not available
Events None
Comments 01-02 Light/Moderate, 16-21 Light Rain/Drizzle
Extra Comments
Issues 1st - 6th: Rainfall data approx; 10-min totals & rain rates unavailable as 5-min logs; monthly sum is correct.
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 5th December 2009.
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

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose