Daily Report for 29th September 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.7 °C (+2.4) 23:54 11.6 °C (+0.1) 14.0 °C (+3.7), 2011 4.4 °C (-5.9), 2024
Maximum Temperature 18.2 °C (+1.1) 13:35 19.8 °C (+0.8) 26.9 °C (+9.8), 2011 14.6 °C (-2.5), 2024
Mean Temperature 15.6 °C (+1.8) 15.6 °C (+0.5) 19.6 °C, 2011 9.8 °C, 2024
Minimum Humidity 80% 18:18 58% 83%, 2014 42%, 2011
Maximum Humidity 94% 06:37 89% 96%, 2010 84%, 2016
Mean Humidity 90% 76% 90%, 2019 70%, 2016
Minimum Pressure 993 hPa 15:34 1015 hPa 1032 hPa, 2015 993 hPa, 2019
Maximum Pressure 1008 hPa 23:59 1022 hPa 1036 hPa, 2015 1008 hPa, 2013
Mean Pressure 998 hPa 1019 hPa 1034 hPa, 2015 998 hPa, 2019
Mean Wind Speed 8.0 mph (+4.1) 4.6 mph (+0.7) 11.4 mph, 2016 0.7 mph, 2025
Maximum Wind Speed 16.6 mph 10:38 12.8 mph 22.7 mph, 2016 5.6 mph, 2025
Maximum Gust 27.0 mph 01:31 20.7 mph 40.3 mph, 2016 9.2 mph, 2025
Mean Wind Direction WSW
Rainfall 4.0 mm 61.1 mm (126%) 11.7 mm, 2010
Maximum Hourly Rain 1.3 mm 14:41 3.5 mm, 2010
Maximum 10-min Rain 0.7 mm 13:56 1.8 mm, 2017
Maximum Rain Rate 7 mm/h 13:56 26 mm/h, 2017
Minimum Dew Point 10.6 °C 23:54 8.3 °C 11.5 °C, 2014 2.7 °C, 2012
Maximum Dew Point 16.2 °C 14:24 13.6 °C 17.4 °C, 2011 8.2 °C, 2018
Mean Dew Point 13.9 °C 11.0 °C 14.1 °C, 2017 6.0 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 14.0 °C * 22:53 11.8 °C 16.8 °C, 2016 4.4 °C, 2024
Day Maximum (09-21) 18.2 °C 13:35 19.8 °C 26.9 °C, 2011 14.6 °C, 2024
Max 10m Temp Rise 0.3 °C 11:59 0.6 °C 0.9 °C, 2018 0.3 °C, 2010
Max 1hr Temp Rise 0.8 °C 10:52 2.4 °C 3.9 °C, 2025 0.8 °C, 2019
Max 1hr Hum Rise 10% 19:17 10% 13%, 2018 3%, 2013
Max 10m Temp Fall 0.5 °C 16:45 0.5 °C 1.0 °C, 2017 0.2 °C, 2014
Max 1hr Temp Fall 1.6 °C 19:14 1.8 °C 3.4 °C, 2018 0.9 °C, 2014
Max 1hr Hum Fall 6% 17:08 11% 18%, 2012 6%, 2019
Max 10m Wind Speed 12.9 mph 03:09 9.3 mph 17.4 mph, 2016 4.0 mph, 2025
Minimum Feels-like 14.3 °C 23:49 12.4 °C 16.1 °C, 2011 3.5 °C, 2022
Maximum Feels-like 22.7 °C 13:45 22.3 °C 30.0 °C, 2011 15.2 °C, 2012
Mean Feels-like 18.9 °C 17.5 °C 22.8 °C, 2011 10.2 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.5 °C (-1.3) 8.3 °C (+0.8) 12.9 °C (+6.1), 2011 4.1 °C (-2.7), 2013
Humidity Range 14% 31% 54%, 2011 13%, 2014
Pressure Range 15 hPa 7 hPa 19 hPa, 2024 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.2 [2%]160 hrs (113%) [48%] 10.61 [100%], 2011 0.1 [1%], 2010
Wet Hours 8
[Mean rain rate: 0.5 mm/h]		52 hrs (131%) [7.5%] 10, 2010 0, 2009
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments Rain spells
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 15.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 29th September 2019.
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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