Daily Report for 28th September 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.7 °C (+1.3) 03:37 11.6 °C (-0.0) 15.4 °C (+5.0), 2023 5.1 °C (-5.3), 2024
Maximum Temperature 18.4 °C (+1.2) 14:48 19.9 °C (+0.8) 24.9 °C (+7.7), 2011 13.8 °C (-3.4), 2022
Mean Temperature 14.8 °C (+1.3) 15.6 °C (+0.4) 18.6 °C, 2011 9.2 °C, 2024
Minimum Humidity 65% 14:56 57% 77%, 2010 47%, 2018
Maximum Humidity 93% 23:17 89% 98%, 2011 84%, 2016
Mean Humidity 82% 75% 90%, 2010 68%, 2018
Minimum Pressure 1005 hPa 23:58 1016 hPa 1035 hPa, 2015 1001 hPa, 2022
Maximum Pressure 1010 hPa 15:18 1022 hPa 1037 hPa, 2015 1002 hPa, 2022
Mean Pressure 1009 hPa 1019 hPa 1036 hPa, 2015 1001 hPa, 2022
Mean Wind Speed 7.0 mph (+3.1) 4.5 mph (+0.6) 9.8 mph, 2016 1.4 mph, 2025
Maximum Wind Speed 17.5 mph 14:01 12.7 mph 21.5 mph, 2016 5.6 mph, 2010
Maximum Gust 29.0 mph 11:14 20.5 mph 30.6 mph, 2016 7.4 mph, 2010
Mean Wind Direction SW
Rainfall 4.0 mm 57.1 mm (122%) 10.8 mm, 2021
Maximum Hourly Rain 3.1 mm 22:20 6.9 mm, 2021
Maximum 10-min Rain 0.9 mm 22:16 3.3 mm, 2021
Maximum Rain Rate 7 mm/h 22:13 60 mm/h, 2021
Minimum Dew Point 10.0 °C 05:11 8.2 °C 12.6 °C, 2010 3.7 °C, 2024
Maximum Dew Point 13.3 °C 23:57 13.5 °C 18.1 °C, 2011 8.3 °C, 2022
Mean Dew Point 11.6 °C 10.9 °C 14.1 °C, 2014 5.9 °C, 2024
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.7 °C 03:42 11.8 °C 15.4 °C, 2017 5.1 °C, 2024
Day Maximum (09-21) 18.4 °C 14:49 19.9 °C 24.9 °C, 2011 13.8 °C, 2022
Max 10m Temp Rise 0.3 °C 11:45 0.6 °C 0.9 °C, 2025 0.3 °C, 2010
Max 1hr Temp Rise 1.0 °C 10:08 2.4 °C 3.4 °C, 2011 1.0 °C, 2019
Max 1hr Hum Rise 10% 20:24 10% 14%, 2012 4%, 2010
Max 10m Temp Fall 0.4 °C 15:28 0.5 °C 0.8 °C, 2012 0.2 °C, 2010
Max 1hr Temp Fall 1.1 °C 20:34 1.8 °C 2.8 °C, 2024 0.7 °C, 2010
Max 1hr Hum Fall 6% 11:37 11% 21%, 2015 4%, 2023
Max 10m Wind Speed 12.9 mph 12:33 9.2 mph 15.9 mph, 2016 4.0 mph, 2010
Minimum Feels-like 13.1 °C 04:57 12.3 °C 17.6 °C, 2023 2.3 °C, 2024
Maximum Feels-like 20.8 °C 14:54 22.3 °C 29.0 °C, 2011 14.1 °C, 2022
Mean Feels-like 16.9 °C 17.5 °C 21.9 °C, 2011 8.6 °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 6.7 °C (-0.1) 8.4 °C (+0.8) 12.3 °C (+5.5), 2011 3.7 °C (-3.1), 2023
Humidity Range 28% 32% 47%, 2011 19%, 2010
Pressure Range 5 hPa 6 hPa 11 hPa, 2024 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]160 hrs (116%) [50%] 10.6 [99%], 2011 0.1 [1%], 2010
Wet Hours 4
[Mean rain rate: 1.0 mm/h]		44 hrs (115%) [6.5%] 6, 2017 0, 2009
Cloud Cover Overcast or Mostly Cloudy
Events None
Comments late rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 15.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 28th 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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Wind rose