Daily Report for 28th August 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.6 °C (-1.7) 06:39 13.8 °C (-0.3) 17.9 °C (+4.6), 2019 10.7 °C (-2.6), 2023
Maximum Temperature 20.6 °C (-1.0) 14:31 21.8 °C (-0.7) 28.2 °C (+6.6), 2024 18.3 °C (-3.3), 2020
Mean Temperature 16.5 °C (-1.4) 17.9 °C (-0.5) 22.0 °C, 2017 14.7 °C, 2020
Minimum Humidity 46% 17:23 50% 71%, 2016 39%, 2013
Maximum Humidity 91% 06:34 86% 94%, 2014 84%, 2009
Mean Humidity 68% 70% 85%, 2020 61%, 2017
Minimum Pressure 1010 hPa 00:22 1011 hPa 1026 hPa, 2021 1000 hPa, 2020
Maximum Pressure 1020 hPa 23:54 1017 hPa 1028 hPa, 2021 1004 hPa, 2020
Mean Pressure 1015 hPa 1013 hPa 1027 hPa, 2021 1002 hPa, 2020
Mean Wind Speed 5.4 mph (+1.4) 4.3 mph (+0.3) 7.6 mph, 2009 1.7 mph, 2013
Maximum Wind Speed 12.8 mph 13:25 12.1 mph 18.4 mph, 2009 5.9 mph, 2013
Maximum Gust 17.6 mph 14:33 17.1 mph 27.6 mph, 2009 7.6 mph, 2013
Mean Wind Direction SW
Rainfall 0.0 mm 57.2 mm (117%) 2.8 mm, 2020
Maximum Hourly Rain n/a 2, 2020
Maximum 10-min Rain n/a 1.4, 2009
Maximum Rain Rate n/a 24, 2014
Minimum Dew Point 7.1 °C 19:32 8.9 °C 14.2 °C, 2016 6.5 °C, 2010
Maximum Dew Point 13.2 °C 09:22 14.6 °C 18.3 °C, 2024 11.0 °C, 2010
Mean Dew Point 10.1 °C 11.8 °C 15.4 °C, 2016 8.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.6 °C 06:39 14.1 °C 18.8 °C, 2019 10.7 °C, 2023
Day Maximum (09-21) 20.6 °C 14:31 21.8 °C 28.2 °C, 2024 18.3 °C, 2020
Max 10m Temp Rise 0.5 °C 07:15 0.6 °C 0.9 °C, 2024 0.3 °C, 2018
Max 1hr Temp Rise 2.1 °C 07:59 2.1 °C 3.5 °C, 2024 1.3 °C, 2014
Max 1hr Hum Rise 14% 21:11 9% 14%, 2011 4%, 2016
Max 10m Temp Fall 0.4 °C 20:13 0.4 °C 0.9 °C, 2021 0.4 °C, 2014
Max 1hr Temp Fall 1.5 °C 21:07 1.6 °C 2.6 °C, 2013 1.1 °C, 2016
Max 1hr Hum Fall 13% 10:22 10% 17%, 2017 6%, 2016
Max 10m Wind Speed 10.3 mph 13:12 9.1 mph 13.8 mph, 2016 4.2 mph, 2013
Minimum Feels-like 13.0 °C 06:28 15.3 °C 21.5 °C, 2019 11.5 °C, 2010
Maximum Feels-like 21.5 °C 13:46 24.4 °C 34.4 °C, 2024 19.7 °C, 2010
Mean Feels-like 17.8 °C 20.2 °C 25.1 °C, 2017 15.8 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.0 °C (+0.7) 8.0 °C (-0.4) 14.6 °C (+6.2), 2024 3.3 °C (-5.1), 2016
Humidity Range 45% 36% 54%, 2013 13%, 2016
Pressure Range 10 hPa 6 hPa 10 hPa, 2015 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [71%]116 hrs (69%) [31%] 11 [87%], 2017 1 [8%], 2016
Wet Hours 050 hrs (145%) [7.4%] 3, 2014 0, 2011
Cloud Cover am: Sunny transitioned to Mostly Sunny
pm: Partly Cloudy
Events None
Comments -
Extra Comments
Issues 1730-2130 data loss, unreconstructed
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 28th August 2015.
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