Daily Report for 30th August 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.4 °C (-2.7) 06:55 14.2 °C (+0.2) 15.5 °C (+2.4), 2013 9.3 °C (-3.8), 2010
Maximum Temperature 19.5 °C (-2.0) 16:15 23.4 °C (+1.0) 25.8 °C (+4.3), 2016 16.1 °C (-5.4), 2020
Mean Temperature 15.2 °C (-2.3) 18.8 °C (+0.6) 19.7 °C, 2013 13.2 °C, 2017
Minimum Humidity 46% 16:28 52% 76%, 2021 34%, 2016
Maximum Humidity 86% 06:54 89% 92%, 2012 76%, 2011
Mean Humidity 68% 72% 84%, 2015 60%, 2016
Minimum Pressure 1022 hPa 00:07 1014 hPa 1026 hPa, 2021 1009 hPa, 2023
Maximum Pressure 1025 hPa 09:38 1020 hPa 1029 hPa, 2021 1011 hPa, 2023
Mean Pressure 1024 hPa 1017 hPa 1027 hPa, 2021 1010 hPa, 2023
Mean Wind Speed 1.9 mph (-2.1) 4.1 mph (+0.1) 6.2 mph, 2019 1.9 mph, 2017
Maximum Wind Speed 7.0 mph 08:03 12.1 mph 16.8 mph, 2012 7.0 mph, 2018
Maximum Gust 10.4 mph 12:49 19.5 mph 26.3 mph, 2012 10.4 mph, 2018
Mean Wind Direction N
Rainfall 0.0 mm 71.0 mm (136%) 9.1 mm, 2017
Maximum Hourly Rain n/a 3.8, 2017
Maximum 10-min Rain n/a 1.3, 2017
Maximum Rain Rate n/a 24, 2014
Minimum Dew Point 7.5 °C 16:29 10.9 °C 13.5 °C, 2015 3.1 °C, 2012
Maximum Dew Point 11.3 °C 23:30 15.8 °C 15.9 °C, 2022 9.8 °C, 2011
Mean Dew Point 9.2 °C 13.3 °C 14.4 °C, 2015 7.1 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.4 °C 06:53 14.6 °C 15.5 °C, 2013 9.3 °C, 2010
Day Maximum (09-21) 19.5 °C 16:18 23.3 °C 25.8 °C, 2016 13.7 °C, 2017
Max 10m Temp Rise 0.6 °C 08:07 0.6 °C 0.8 °C, 2013 0.2 °C, 2017
Max 1hr Temp Rise 2.1 °C 09:48 2.4 °C 3.3 °C, 2022 0.5 °C, 2017
Max 1hr Hum Rise 13% 23:02 12% 13%, 2018 4%, 2015
Max 10m Temp Fall 0.5 °C 13:04 0.7 °C 0.9 °C, 2012 0.3 °C, 2009
Max 1hr Temp Fall 1.8 °C 20:33 2.2 °C 2.3 °C, 2013 0.8 °C, 2021
Max 1hr Hum Fall 9% 09:55 13% 18%, 2012 3%, 2021
Max 10m Wind Speed 4.4 mph 08:04 8.8 mph 11.6 mph, 2012 4.4 mph, 2018
Minimum Feels-like 10.9 °C 06:46 16.2 °C 18.2 °C, 2013 6.7 °C, 2010
Maximum Feels-like 20.6 °C 15:06 26.9 °C 27.3 °C, 2019 16.8 °C, 2011
Mean Feels-like 16.1 °C 21.9 °C 22.7 °C, 2013 14.3 °C, 2017
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.1 °C (+0.7) 9.2 °C (+0.8) 14.0 °C (+5.6), 2016 3.0 °C (-5.4), 2021
Humidity Range 40% 37% 53%, 2016 13%, 2017
Pressure Range 3 hPa 6 hPa 15 hPa, 2012 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [64%]178 hrs (99%) [45%] 12.2 [98%], 2016 0 [0%], 2011
Wet Hours 040 hrs (107%) [5.5%] 7, 2017 0, 2009
Cloud Cover am: Sunny
pm: Partly Cloudy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 30th August 2018.
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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