Daily Report for 9th September 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.3 °C (-2.9) 02:52 12.1 °C (-0.4) 17.6 °C (+5.4), 2023 9.3 °C (-2.9), 2013
Maximum Temperature 12.9 °C (-7.3) 16:08 21.4 °C (+0.7) 31.7 °C (+11.5), 2023 12.9 °C (-7.3), 2013
Mean Temperature 11.1 °C (-5.1) 16.5 °C (+0.2) 24.9 °C, 2023 11.1 °C, 2013
Minimum Humidity 84% 00:06 51% 84%, 2013 30%, 2012
Maximum Humidity 95% 18:34 89% 96%, 2011 82%, 2009
Mean Humidity 92% 72% 92%, 2013 60%, 2012
Minimum Pressure 1014 hPa 14:30 1017 hPa 1023 hPa, 2020 996 hPa, 2017
Maximum Pressure 1017 hPa 23:55 1021 hPa 1033 hPa, 2009 1002 hPa, 2017
Mean Pressure 1016 hPa 1019 hPa 1027 hPa, 2009 998 hPa, 2017
Mean Wind Speed 2.5 mph (-1.4) 3.2 mph (-0.7) 11.4 mph, 2016 1.3 mph, 2023
Maximum Wind Speed 8.1 mph 14:17 10.2 mph 21.9 mph, 2016 7.0 mph, 2023
Maximum Gust 13.5 mph 13:35 14.8 mph 33.9 mph, 2016 10.4 mph, 2023
Mean Wind Direction N
Rainfall 6.8 mm 11.6 mm (77%) 6.8 mm, 2013
Maximum Hourly Rain 3.4 mm 13:29 3.6 mm, 2011
Maximum 10-min Rain 1.2 mm 13:12 1.9 mm, 2011
Maximum Rain Rate 9 mm/h 13:09 20 mm/h, 2011
Minimum Dew Point 7.4 °C 02:41 8.2 °C 15.6 °C, 2023 5.4 °C, 2009
Maximum Dew Point 12.0 °C 16:08 14.0 °C 21.1 °C, 2023 11.7 °C, 2019
Mean Dew Point 9.9 °C 10.9 °C 18.2 °C, 2023 9.1 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.3 °C 02:52 12.2 °C 17.6 °C, 2023 9.3 °C, 2013
Day Maximum (09-21) 12.9 °C 16:08 21.3 °C 31.7 °C, 2023 12.9 °C, 2013
Max 10m Temp Rise 0.3 °C 15:59 0.7 °C 0.9 °C, 2012 0.3 °C, 2011
Max 1hr Temp Rise 1.0 °C 08:36 2.7 °C 4.7 °C, 2012 1.0 °C, 2013
Max 1hr Hum Rise 3% 03:07 9% 19%, 2017 3%, 2011
Max 10m Temp Fall 0.2 °C 02:12 0.5 °C 0.9 °C, 2017 0.2 °C, 2013
Max 1hr Temp Fall 0.9 °C 19:31 1.8 °C 2.8 °C, 2012 0.6 °C, 2019
Max 1hr Hum Fall 5% 09:50 12% 26%, 2015 5%, 2013
Max 10m Wind Speed 6.6 mph 00:01 7.6 mph 17.2 mph, 2016 4.3 mph, 2023
Minimum Feels-like 7.8 °C 03:05 12.9 °C 22.1 °C, 2023 7.8 °C, 2013
Maximum Feels-like 15.2 °C 16:01 23.5 °C 39.7 °C, 2023 15.2 °C, 2013
Mean Feels-like 12.3 °C 18.4 °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 3.6 °C (-4.4) 9.3 °C (+1.1) 17.5 °C (+9.5), 2012 3.6 °C (-4.4), 2013
Humidity Range 11% 39% 54%, 2012 11%, 2013
Pressure Range 3 hPa 4 hPa 12 hPa, 2009 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.3 [3%]56 hrs (119%) [51%] 11 [93%], 2023 0 [0%], 2019
Wet Hours 5
[Mean rain rate: 1.4 mm/h]
12 hrs (98%) [5.6%] 5, 2013 0, 2009
Cloud Cover am: Overcast
pm: Overcast transitioned to Mostly Cloudy
Events None
Comments 10-17 Light-Moderate Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 9th September 2013.
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

daycamsumLarge resolution version

Wind rose