Daily Report for 1st September 2014

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.5 °C (-0.4) 06:28 12.5 °C (-0.3) 15.1 °C (+2.2), 2023 6.3 °C (-6.6), 2020
Maximum Temperature 18.8 °C (-2.5) 18:27 18.8 °C (-2.4) 23.7 °C (+2.4), 2018 17.8 °C (-3.5), 2015
Mean Temperature 15.8 °C (-1.4) 15.8 °C (-1.4) 18.6 °C, 2022 13.8 °C, 2020
Minimum Humidity 76% 00:17 76% 76%, 2014 40%, 2013
Maximum Humidity 95% 23:32 95% 96%, 2020 73%, 2013
Mean Humidity 88% 88% 89%, 2023 58%, 2013
Minimum Pressure 1019 hPa 18:23 1019 hPa 1030 hPa, 2021 1003 hPa, 2009
Maximum Pressure 1021 hPa 22:39 1021 hPa 1033 hPa, 2021 1010 hPa, 2009
Mean Pressure 1020 hPa 1020 hPa 1032 hPa, 2021 1006 hPa, 2009
Mean Wind Speed 3.3 mph (-0.6) 3.3 mph (-0.6) 6.3 mph, 2009 0.3 mph, 2020
Maximum Wind Speed 9.7 mph 12:27 9.7 mph 17.3 mph, 2009 5.2 mph, 2020
Maximum Gust 10.7 mph 10:06 10.7 mph 35.6 mph, 2009 8.1 mph, 2020
Mean Wind Direction W
Rainfall 4.2 mm 4.2 mm (252%) 4.7 mm, 2015
Maximum Hourly Rain 3.5 mm 19:49 4.5 mm, 2015
Maximum 10-min Rain 2.8 mm 19:42 3.1 mm, 2015
Maximum Rain Rate 30 mm/h 19:41 48 mm/h, 2015
Minimum Dew Point 10.6 °C 04:54 10.6 °C 13.4 °C, 2023 3.4 °C, 2013
Maximum Dew Point 17.2 °C 17:36 17.2 °C 18.3 °C, 2023 9.8 °C, 2013
Mean Dew Point 13.8 °C 13.8 °C 16.0 °C, 2023 7.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.5 °C 06:28 12.5 °C 15.1 °C, 2023 6.3 °C, 2020
Day Maximum (09-21) 18.8 °C 18:27 18.8 °C 23.7 °C, 2018 17.8 °C, 2015
Max 10m Temp Rise 0.4 °C 07:06 0.4 °C 1.0 °C, 2010 0.4 °C, 2014
Max 1hr Temp Rise 1.5 °C 07:53 1.5 °C 4.5 °C, 2010 1.1 °C, 2015
Max 1hr Hum Rise 4% 10:58 4% 12%, 2020 4%, 2014
Max 10m Temp Fall 0.4 °C 20:27 0.4 °C 0.8 °C, 2019 0.2 °C, 2022
Max 1hr Temp Fall 1.7 °C 21:07 1.7 °C 2.8 °C, 2018 0.9 °C, 2021
Max 1hr Hum Fall 3% 08:04 3% 19%, 2020 3%, 2014
Max 10m Wind Speed 6.8 mph 12:32 6.8 mph 11.6 mph, 2009 2.9 mph, 2020
Minimum Feels-like 14.1 °C 06:21 14.1 °C 18.2 °C, 2023 6.3 °C, 2020
Maximum Feels-like 24.2 °C 18:11 24.2 °C 28.4 °C, 2023 20.5 °C, 2015
Mean Feels-like 19.2 °C 19.2 °C 22.6 °C, 2023 14.5 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.3 °C (-2.1) 6.3 °C (-2.1) 13.6 °C (+5.2), 2020 4.3 °C (-4.1), 2021
Humidity Range 19% 19% 51%, 2018 16%, 2021
Pressure Range 2 hPa 2 hPa 8 hPa, 2019 2 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [8%]1 hrs (19%) [8.1%] 12.2 [99%], 2010 0 [0%], 2021
Wet Hours 5
[Mean rain rate: 0.8 mm/h]		5 hrs (366%) [21%] 5, 2014 0, 2010
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments 10-17 Light Drizzle spells, 1930 Heavy Shower
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 1st September 2014.
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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose