Daily Report for 9th September 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.5 °C (+3.4) 01:06 15.7 °C (+3.4) 17.6 °C (+5.5), 2023 8.8 °C (-3.3), 2025
Maximum Temperature 22.4 °C (+2.4) 14:32 22.4 °C (+1.9) 31.7 °C (+11.7), 2023 12.9 °C (-7.1), 2013
Mean Temperature 18.3 °C (+2.9) 18.9 °C (+2.6) 24.9 °C, 2023 11.1 °C, 2013
Minimum Humidity 67% 14:11 62% 84%, 2013 30%, 2012
Maximum Humidity 87% 06:03 88% 96%, 2011 82%, 2009
Mean Humidity 82% 77% 92%, 2013 60%, 2012
Minimum Pressure 1014 hPa 11:48 1012 hPa 1023 hPa, 2020 996 hPa, 2017
Maximum Pressure 1016 hPa 08:48 1021 hPa 1033 hPa, 2009 1002 hPa, 2017
Mean Pressure 1015 hPa 1017 hPa 1027 hPa, 2009 998 hPa, 2017
Mean Wind Speed 11.4 mph (+7.5) 6.0 mph (+2.1) 11.4 mph, 2016 1.3 mph, 2023
Maximum Wind Speed 21.9 mph 18:07 16.4 mph 21.9 mph, 2016 7.0 mph, 2023
Maximum Gust 33.9 mph 16:40 24.4 mph 33.9 mph, 2016 10.4 mph, 2023
Mean Wind Direction SW
Rainfall 0.0 mm 9.2 mm (61%) 6.8 mm, 2013
Maximum Hourly Rain n/a 3.6, 2011
Maximum 10-min Rain n/a 1.9, 2011
Maximum Rain Rate n/a 20, 2011
Minimum Dew Point 12.6 °C 12:09 12.4 °C 15.6 °C, 2023 5.4 °C, 2009
Maximum Dew Point 17.5 °C 13:45 17.1 °C 21.1 °C, 2023 11.7 °C, 2019
Mean Dew Point 15.1 °C 14.8 °C 18.2 °C, 2023 9.1 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.5 °C 01:06 16.1 °C 17.6 °C, 2023 8.8 °C, 2025
Day Maximum (09-21) 22.4 °C 14:32 22.4 °C 31.7 °C, 2023 12.9 °C, 2013
Max 10m Temp Rise 0.5 °C 13:45 0.6 °C 1.1 °C, 2025 0.3 °C, 2011
Max 1hr Temp Rise 1.0 °C 14:31 1.7 °C 5.6 °C, 2025 1.0 °C, 2013
Max 1hr Hum Rise 7% 15:40 8% 19%, 2017 3%, 2011
Max 10m Temp Fall 0.4 °C 14:54 0.4 °C 0.9 °C, 2017 0.2 °C, 2013
Max 1hr Temp Fall 1.3 °C 15:31 1.4 °C 2.8 °C, 2012 0.6 °C, 2019
Max 1hr Hum Fall 20% 13:46 11% 26%, 2015 5%, 2013
Max 10m Wind Speed 17.2 mph 15:35 12.5 mph 17.2 mph, 2016 4.3 mph, 2023
Minimum Feels-like 18.7 °C 00:09 19.0 °C 22.1 °C, 2023 7.8 °C, 2013
Maximum Feels-like 27.4 °C 13:45 26.7 °C 39.7 °C, 2023 15.2 °C, 2013
Mean Feels-like 22.3 °C 23.0 °C 31.1 °C, 2023 12.3 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.9 °C (-1.0) 6.7 °C (-1.5) 17.5 °C (+9.6), 2012 3.6 °C (-4.3), 2013
Humidity Range 20% 26% 54%, 2012 11%, 2013
Pressure Range 2 hPa 8 hPa 12 hPa, 2009 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [25%]32 hrs (68%) [29%] 11 [93%], 2023 0 [0%], 2019
Wet Hours 014 hrs (114%) [6.5%] 5, 2013 0, 2009
Cloud Cover Partly Cloudy with periods of Mostly Cloudy
Events None
Comments -
Extra Comments
Issues T/H data from StAlbans / casa
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 9th September 2016.
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

daycamsumLarge resolution version

Wind rose