Daily Report for 13th September 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.6 °C (+0.8) 07:39 11.4 °C (-0.9) 17.7 °C (+5.9), 2016 6.1 °C (-5.7), 2024
Maximum Temperature 20.8 °C (+1.4) 15:35 19.6 °C (-0.7) 32.0 °C (+12.6), 2016 16.3 °C (-3.1), 2009
Mean Temperature 17.0 °C (+1.1) 15.5 °C (-0.8) 24.8 °C, 2016 10.9 °C, 2024
Minimum Humidity 41% 16:08 53% 91%, 2013 36%, 2016
Maximum Humidity 89% 02:56 86% 98%, 2013 78%, 2011
Mean Humidity 67% 72% 96%, 2013 62%, 2016
Minimum Pressure 1030 hPa 00:00 1019 hPa 1030 hPa, 2019 993 hPa, 2017
Maximum Pressure 1037 hPa 21:55 1026 hPa 1037 hPa, 2019 1002 hPa, 2017
Mean Pressure 1034 hPa 1023 hPa 1034 hPa, 2019 999 hPa, 2017
Mean Wind Speed 3.2 mph (-0.7) 4.7 mph (+0.8) 10.2 mph, 2017 2.1 mph, 2018
Maximum Wind Speed 9.4 mph 15:55 13.1 mph 24.2 mph, 2017 7.8 mph, 2013
Maximum Gust 15.0 mph 13:21 21.9 mph 41.5 mph, 2017 12.7 mph, 2013
Mean Wind Direction NNE
Rainfall 0.0 mm 6.1 mm (28%) 32.0 mm, 2013
Maximum Hourly Rain n/a 9, 2013
Maximum 10-min Rain n/a 2.2, 2013
Maximum Rain Rate n/a 42, 2013
Minimum Dew Point 5.1 °C 19:09 7.0 °C 14.7 °C, 2016 4.1 °C, 2024
Maximum Dew Point 15.7 °C 01:14 13.0 °C 17.7 °C, 2016 8.6 °C, 2024
Mean Dew Point 10.4 °C 10.3 °C 16.3 °C, 2016 5.9 °C, 2024
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.6 °C 07:39 11.5 °C 17.7 °C, 2016 6.1 °C, 2024
Day Maximum (09-21) 20.8 °C 15:37 19.6 °C 32.2 °C, 2016 16.3 °C, 2009
Max 10m Temp Rise 0.5 °C 10:09 0.6 °C 1.1 °C, 2016 0.2 °C, 2013
Max 1hr Temp Rise 1.9 °C 10:09 2.3 °C 3.9 °C, 2018 0.8 °C, 2013
Max 1hr Hum Rise 32% 20:33 10% 32%, 2019 3%, 2013
Max 10m Temp Fall 0.5 °C 19:38 0.5 °C 1.6 °C, 2017 0.3 °C, 2010
Max 1hr Temp Fall 1.9 °C 19:31 1.5 °C 2.9 °C, 2024 0.9 °C, 2010
Max 1hr Hum Fall 11% 04:17 12% 22%, 2017 1%, 2013
Max 10m Wind Speed 6.2 mph 05:56 9.5 mph 18.4 mph, 2017 5.8 mph, 2024
Minimum Feels-like 13.9 °C 07:39 11.7 °C 23.4 °C, 2016 2.9 °C, 2024
Maximum Feels-like 22.2 °C 00:00 21.6 °C 36.9 °C, 2016 16.6 °C, 2024
Mean Feels-like 18.7 °C 17.0 °C 29.6 °C, 2016 10.3 °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 8.2 °C (+0.6) 8.2 °C (+0.2) 14.3 °C (+6.7), 2016 4.3 °C (-3.3), 2022
Humidity Range 48% 33% 56%, 2018 7%, 2013
Pressure Range 7 hPa 7 hPa 10 hPa, 2015 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11.6 [100%]69 hrs (103%) [44%] 11.6 [100%], 2019 0 [0%], 2013
Wet Hours 08 hrs (45%) [2.6%] 15, 2013 0, 2009
Cloud Cover Sunny
Events Maximum possible sunshine
Comments -
Extra Comments dramatic DP increase at 8pm
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 16.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th 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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Webcam Summary of Cloud Conditions

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