Daily Report for 24th October 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.2 °C (+3.3) 08:01 10.3 °C (+1.4) 14.2 °C (+6.3), 2017 3.0 °C (-4.9), 2010
Maximum Temperature 16.5 °C (+2.7) 14:29 17.5 °C (+2.4) 18.4 °C (+4.6), 2017 9.8 °C (-4.0), 2010
Mean Temperature 13.7 °C (+3.0) 13.8 °C (+1.9) 16.1 °C, 2017 6.1 °C, 2010
Minimum Humidity 57% 15:18 55% 89%, 2019 57%, 2011
Maximum Humidity 87% 23:59 87% 98%, 2009 79%, 2016
Mean Humidity 72% 72% 95%, 2012 72%, 2011
Minimum Pressure 993 hPa 19:57 1016 hPa 1026 hPa, 2018 993 hPa, 2011
Maximum Pressure 1002 hPa 00:05 1022 hPa 1031 hPa, 2018 1002 hPa, 2011
Mean Pressure 998 hPa 1019 hPa 1029 hPa, 2018 998 hPa, 2011
Mean Wind Speed 6.5 mph (+2.4) 5.4 mph (+1.3) 7.4 mph, 2017 1.9 mph, 2023
Maximum Wind Speed 12.5 mph 13.2 mph 22.6 mph, 2020 9.9 mph, 2019
Maximum Gust 21.0 mph 13:07 19.7 mph 35.7 mph, 2020 13.7 mph, 2013
Mean Wind Direction ESE
Rainfall 0.8 mm 9.9 mm (20%) 9.5 mm, 2019
Maximum Hourly Rain 0.8 mm 23:13 6.2 mm, 2019
Maximum 10-min Rain 0.5 mm 23:13 1.4 mm, 2020
Maximum Rain Rate 1.8 mm/h 22:37 24 mm/h, 2020
Minimum Dew Point 7.6 °C 15:58 6.3 °C 12.9 °C, 2017 1.6 °C, 2010
Maximum Dew Point 11.6 °C 23:57 11.6 °C 16.2 °C, 2009 5.0 °C, 2010
Mean Dew Point 8.7 °C 8.6 °C 14.2 °C, 2017 3.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.2 °C 08:00 10.5 °C 14.2 °C, 2017 3.0 °C, 2010
Day Maximum (09-21) 16.5 °C 14:27 17.3 °C 18.4 °C, 2017 9.8 °C, 2010
Max 10m Temp Rise 0.3 °C 10:00 0.5 °C 0.9 °C, 2013 0.1 °C, 2019
Max 1hr Temp Rise 1.4 °C 11:45 2.1 °C 3.4 °C, 2013 0.6 °C, 2019
Max 1hr Hum Rise 10% 22:55 7% 11%, 2010 3%, 2014
Max 10m Temp Fall 0.7 °C 16:20 0.4 °C 0.9 °C, 2009 0.2 °C, 2012
Max 1hr Temp Fall 1.6 °C 16:56 1.3 °C 2.7 °C, 2015 0.5 °C, 2021
Max 1hr Hum Fall 6% 11:21 9% 19%, 2009 4%, 2015
Max 10m Wind Speed 9.5 mph 13:11 9.0 mph 18.0 mph, 2020 6.5 mph, 2018
Minimum Feels-like 11.6 °C 07:53 10.3 °C 16.9 °C, 2017 1.2 °C, 2010
Maximum Feels-like 17.2 °C 14:20 19.2 °C 22.6 °C, 2017 9.8 °C, 2010
Mean Feels-like 14.4 °C 14.9 °C 19.7 °C, 2017 5.0 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.3 °C (-0.6) 7.2 °C (+1.0) 11.2 °C (+5.3), 2013 2.5 °C (-3.4), 2019
Humidity Range 30% 32% 31%, 2013 6%, 2019
Pressure Range 9 hPa 6 hPa 17 hPa, 2010 1 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [55%]127 hrs (136%) [54%] 9 [99%], 2024 0 [0%], 2014
Wet Hours 1.5
[Mean rain rate: 0.5 mm/h]		11 hrs (29%) [1.9%] 6, 2020 0, 2012
Cloud Cover Hazy with periods of Mostly Cloudy
Events None
Comments 22-23 Light Rain
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 24th October 2011.
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.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose