Daily Report for 8th September 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.5 °C (-2.7) 06:41 11.7 °C (-0.7) 17.4 °C (+5.2), 2023 6.9 °C (-5.3), 2019
Maximum Temperature 26.7 °C (+6.5) 16:29 22.8 °C (+2.2) 29.7 °C (+9.5), 2023 16.0 °C (-4.2), 2015
Mean Temperature 18.3 °C (+1.9) 17.2 °C (+0.8) 23.2 °C, 2023 12.1 °C, 2019
Minimum Humidity 24% 16:41 43% 80%, 2022 24%, 2012
Maximum Humidity 84% 07:24 86% 97%, 2022 82%, 2016
Mean Humidity 54% 65% 91%, 2022 54%, 2012
Minimum Pressure 1017 hPa 20:42 1023 hPa 1025 hPa, 2015 996 hPa, 2017
Maximum Pressure 1023 hPa 02:45 1027 hPa 1031 hPa, 2015 1007 hPa, 2017
Mean Pressure 1020 hPa 1025 hPa 1028 hPa, 2015 1000 hPa, 2017
Mean Wind Speed 1.8 mph (-2.1) 3.2 mph (-0.7) 6.6 mph, 2016 0.7 mph, 2024
Maximum Wind Speed 7.6 mph 18:18 9.0 mph 22.3 mph, 2016 5.9 mph, 2014
Maximum Gust 10.0 mph 19:48 12.7 mph 33.9 mph, 2016 7.6 mph, 2014
Mean Wind Direction SW
Rainfall 0.0 mm 0.0 mm (0%) 10.3 mm, 2024
Maximum Hourly Rain n/a 6, 2024
Maximum 10-min Rain n/a 4.1, 2010
Maximum Rain Rate n/a 50, 2010
Minimum Dew Point 4.0 °C 18:51 6.6 °C 16.1 °C, 2023 4.0 °C, 2012
Maximum Dew Point 12.3 °C 10:58 13.1 °C 21.7 °C, 2023 8.9 °C, 2019
Mean Dew Point 7.7 °C 9.9 °C 18.6 °C, 2023 6.5 °C, 2019
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.5 °C 06:42 11.7 °C 17.8 °C, 2016 6.9 °C, 2019
Day Maximum (09-21) 26.7 °C 16:30 22.8 °C 29.7 °C, 2023 16.0 °C, 2015
Max 10m Temp Rise 1.2 °C 08:11 0.7 °C 1.2 °C, 2012 0.3 °C, 2011
Max 1hr Temp Rise 4.9 °C 08:35 3.1 °C 4.9 °C, 2012 1.0 °C, 2017
Max 1hr Hum Rise 13% 20:06 9% 16%, 2013 4%, 2020
Max 10m Temp Fall 0.8 °C 21:33 0.5 °C 1.4 °C, 2013 0.3 °C, 2015
Max 1hr Temp Fall 4.0 °C 22:14 2.2 °C 4.0 °C, 2012 1.1 °C, 2018
Max 1hr Hum Fall 14% 09:01 13% 18%, 2013 5%, 2015
Max 10m Wind Speed 5.2 mph 18:27 6.6 mph 17.7 mph, 2016 4.1 mph, 2014
Minimum Feels-like 9.2 °C 07:03 12.4 °C 22.1 °C, 2023 5.3 °C, 2019
Maximum Feels-like 26.7 °C 16:23 24.5 °C 38.2 °C, 2023 17.1 °C, 2015
Mean Feels-like 18.8 °C 18.6 °C 29.8 °C, 2023 11.8 °C, 2019
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 17.2 °C (+9.2) 11.1 °C (+2.9) 17.2 °C (+9.2), 2012 5.3 °C (-2.7), 2022
Humidity Range 60% 43% 60%, 2012 17%, 2022
Pressure Range 6 hPa 4 hPa 11 hPa, 2017 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11.5 [97%]65 hrs (158%) [68%] 11.7 [99%], 2014 0.3 [3%], 2010
Wet Hours 00.1 hrs (1%) [0.1%] 6, 2017 0, 2009
Cloud Cover am: Sunny
pm: Sunny transitioned to Mostly Sunny
Events Maximum possible sunshine
Comments -
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 8th September 2012.
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.
View monthly summary

Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

daycamsum

Wind rose