Daily Report for 27th August 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.0 °C (-0.3) 04:31 15.1 °C (+1.1) 16.1 °C (+2.8), 2019 10.5 °C (-2.8), 2014
Maximum Temperature 20.9 °C (-0.7) 17:03 23.4 °C (+0.9) 31.7 °C (+10.1), 2019 17.3 °C (-4.3), 2010
Mean Temperature 17.6 °C (-0.5) 19.0 °C (+1.0) 24.1 °C, 2019 14.0 °C, 2010
Minimum Humidity 52% 16:23 46% 70%, 2020 39%, 2019
Maximum Humidity 89% 07:15 88% 98%, 2010 73%, 2017
Mean Humidity 70% 69% 85%, 2010 58%, 2017
Minimum Pressure 1009 hPa 23:59 1011 hPa 1023 hPa, 2021 1002 hPa, 2020
Maximum Pressure 1019 hPa 01:00 1017 hPa 1026 hPa, 2021 1011 hPa, 2015
Mean Pressure 1014 hPa 1014 hPa 1024 hPa, 2021 1007 hPa, 2015
Mean Wind Speed 5.7 mph (+1.7) 4.6 mph (+0.6) 5.8 mph, 2009 1.4 mph, 2017
Maximum Wind Speed 14.5 mph 15:37 11.9 mph 16.5 mph, 2016 6.1 mph, 2017
Maximum Gust 22.8 mph 21:25 16.5 mph 25.8 mph, 2016 9.4 mph, 2017
Mean Wind Direction SSW
Rainfall trace 27.0 mm (57%) 4.8, 2020
Maximum Hourly Rain n/a 1.9, 2020
Maximum 10-min Rain n/a 1.8, 2015
Maximum Rain Rate n/a 42, 2015
Minimum Dew Point 10.0 °C 02:24 10.1 °C 14.0 °C, 2019 6.4 °C, 2013
Maximum Dew Point 14.5 °C 08:23 15.4 °C 18.7 °C, 2019 12.8 °C, 2011
Mean Dew Point 11.8 °C 12.7 °C 16.3 °C, 2019 10.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.0 °C 04:32 15.1 °C 16.1 °C, 2019 10.5 °C, 2014
Day Maximum (09-21) 20.9 °C 17:04 23.4 °C 31.7 °C, 2019 17.3 °C, 2010
Max 10m Temp Rise 0.8 °C 07:47 0.7 °C 0.9 °C, 2022 0.4 °C, 2015
Max 1hr Temp Rise 3.1 °C 08:23 2.4 °C 3.6 °C, 2019 1.6 °C, 2010
Max 1hr Hum Rise 10% 23:42 10% 16%, 2019 4%, 2018
Max 10m Temp Fall 0.4 °C 23:42 0.5 °C 0.7 °C, 2013 0.2 °C, 2014
Max 1hr Temp Fall 1.0 °C 04:23 1.9 °C 3.5 °C, 2017 0.8 °C, 2014
Max 1hr Hum Fall 11% 08:41 12% 18%, 2014 6%, 2017
Max 10m Wind Speed 11.1 mph 15:47 8.9 mph 12.8 mph, 2016 4.2 mph, 2017
Minimum Feels-like 14.4 °C 04:23 17.4 °C 19.5 °C, 2019 11.5 °C, 2014
Maximum Feels-like 22.9 °C 13:04 26.1 °C 37.9 °C, 2019 19.1 °C, 2010
Mean Feels-like 19.8 °C 21.7 °C 29.0 °C, 2019 15.8 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.9 °C (-0.5) 8.3 °C (-0.2) 15.6 °C (+7.2), 2019 4.7 °C (-3.7), 2020
Humidity Range 37% 41% 52%, 2013 24%, 2020
Pressure Range 10 hPa 6 hPa 17 hPa, 2020 3 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [16%]142 hrs (88%) [40%] 11.5 [91%], 2019 1 [8%], 2010
Wet Hours 0.313 hrs (38%) [1.9%] 7, 2010 0, 2009
Cloud Cover am: Mostly Cloudy transitioned to Overcast
pm: Mostly Cloudy
Events None
Comments 18, 21, 22- Slight brief Showers
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 27th August 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

day graph

Webcam Summary of Cloud Conditions

daycamsum

Wind rose