Daily Report for 28th November 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.3 °C (+0.1) 07:00 7.3 °C (+1.8) 9.5 °C (+5.3), 2014 -5.0 °C (-9.2), 2010
Maximum Temperature 8.4 °C (-1.2) 13:20 12.1 °C (+1.4) 13.2 °C (+3.6), 2018 0.6 °C (-9.0), 2010
Mean Temperature 5.8 °C (-0.6) 9.5 °C (+1.6) 11.9 °C, 2018 -2.1 °C, 2010
Minimum Humidity 67% 13:44 72% 89%, 2020 47%, 2016
Maximum Humidity 98% 23:56 94% 98%, 2009 72%, 2016
Mean Humidity 85% 86% 93%, 2022 61%, 2016
Minimum Pressure 985 hPa 23:31 997 hPa 1033 hPa, 2013 985 hPa, 2009
Maximum Pressure 998 hPa 00:18 1006 hPa 1035 hPa, 2013 998 hPa, 2009
Mean Pressure 992 hPa 1002 hPa 1034 hPa, 2013 992 hPa, 2009
Mean Wind Speed 5.3 mph (+0.7) 6.1 mph (+1.5) 8.2 mph, 2015 1.3 mph, 2013
Maximum Wind Speed 15.0 mph 14.2 mph 21.3 mph, 2018 6.7 mph, 2013
Maximum Gust 22.3 mph 11:31 20.6 mph 34.2 mph, 2021 8.7 mph, 2013
Mean Wind Direction SW
Rainfall 13.9 mm 112.0 mm (179%) 13.9 mm, 2009
Maximum Hourly Rain 3.0 mm 21:51 3.0 mm, 2009
Maximum 10-min Rain n/a 21:06 0.7, 2018
Maximum Rain Rate n/a 21:00 3.3, 2018
Minimum Dew Point 2.1 °C 15:43 5.0 °C 8.6 °C, 2014 -6.7 °C, 2010
Maximum Dew Point 7.4 °C 23:56 9.8 °C 11.9 °C, 2018 -2.2 °C, 2010
Mean Dew Point 3.4 °C 7.2 °C 10.8 °C, 2018 -4.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.3 °C 7.7 °C 9.5 °C, 2014 -5.0 °C, 2010
Day Maximum (09-21) 8.4 °C 11.9 °C 13.2 °C, 2018 0.6 °C, 2010
Max 10m Temp Rise n/a 23:56 0.5 °C 0.7, 2022 0.1, 2012
Max 1hr Temp Rise n/a 23:56 1.1 °C 2.8, 2022 0.3, 2012
Max 1hr Hum Rise n/a 19:15 6% 16, 2021 2, 2013
Max 10m Temp Fall n/a 06:05 0.4 °C 0.8, 2021 0.1, 2013
Max 1hr Temp Fall n/a 06:47 1.0 °C 1.6, 2022 0.4, 2013
Max 1hr Hum Fall n/a 10:26 8% 17, 2016 2, 2013
Max 10m Wind Speed 12.8 mph 10:15 10.5 mph 15.3 mph, 2018 4.2 mph, 2013
Minimum Feels-like 0.8 °C 07:35 5.7 °C 7.4 °C, 2014 -7.0 °C, 2021
Maximum Feels-like 7.9 °C 23:56 13.8 °C 15.4 °C, 2018 0.6 °C, 2010
Mean Feels-like 4.6 °C 9.6 °C 13.4 °C, 2018 -3.4 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 18 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.1 °C (-1.3) 4.9 °C (-0.4) 12.3 °C (+6.9), 2011 1.8 °C (-3.6), 2013
Humidity Range 31% 22% 31%, 2009 7%, 2019
Pressure Range 13 hPa 9 hPa 18 hPa, 2019 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [67%]68 hrs (86%) [30%] 7.4 [100%], 2016 0 [0%], 2013
Wet Hours 8
[Mean rain rate: 1.7 mm/h]
79 hrs (135%) [12%] 8, 2009 0, 2010
Cloud Cover not available
Events None
Comments 01-05 Moderate, 18-22 Heavy Rain
Extra Comments
Issues ALL MONTH: Rainfall data is approximate and 10-min totals & rain rates are unavailable due to 5-min logging, but 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 28th November 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