Daily Report for 19th August 2019

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.5 °C (-1.5) 05:19 14.6 °C (+0.2) 17.7 °C (+3.7), 2012 9.1 °C (-4.9), 2011
Maximum Temperature 21.1 °C (-1.2) 16:30 22.5 °C (-0.3) 29.5 °C (+7.2), 2012 18.1 °C (-4.2), 2014
Mean Temperature 16.5 °C (-1.4) 18.3 °C (-0.0) 23.6 °C, 2012 13.8 °C, 2014
Minimum Humidity 48% 18:39 55% 85%, 2020 35%, 2009
Maximum Humidity 91% 05:44 90% 97%, 2011 76%, 2014
Mean Humidity 73% 75% 92%, 2020 56%, 2013
Minimum Pressure 1010 hPa 00:06 1009 hPa 1018 hPa, 2018 1000 hPa, 2020
Maximum Pressure 1020 hPa 23:53 1015 hPa 1026 hPa, 2013 1009 hPa, 2016
Mean Pressure 1014 hPa 1012 hPa 1019 hPa, 2018 1005 hPa, 2020
Mean Wind Speed 6.4 mph (+2.4) 5.8 mph (+1.8) 7.1 mph, 2023 2.6 mph, 2012
Maximum Wind Speed 16.5 mph 16:09 14.6 mph 22.3 mph, 2016 9.2 mph, 2012
Maximum Gust 24.2 mph 16:14 23.8 mph 30.6 mph, 2016 12.5 mph, 2013
Mean Wind Direction WSW
Rainfall 0.4 mm 36.6 mm (111%) 11.5 mm, 2020
Maximum Hourly Rain 0.2 mm 3.5 mm, 2020
Maximum 10-min Rain 0.2 mm 0.9 mm, 2015
Maximum Rain Rate n/a 18, 2015
Minimum Dew Point 7.8 °C 19:57 11.5 °C 14.6 °C, 2023 4.1 °C, 2014
Maximum Dew Point 14.3 °C 13:32 15.7 °C 19.8 °C, 2012 8.5 °C, 2014
Mean Dew Point 11.2 °C 13.6 °C 16.8 °C, 2020 5.7 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.5 °C 05:21 14.8 °C 19.1 °C, 2022 9.1 °C, 2011
Day Maximum (09-21) 21.1 °C 16:30 22.5 °C 29.5 °C, 2012 18.1 °C, 2014
Max 10m Temp Rise 0.8 °C 13:34 0.6 °C 0.9 °C, 2012 0.2 °C, 2016
Max 1hr Temp Rise 2.1 °C 10:02 2.2 °C 3.2 °C, 2012 0.7 °C, 2016
Max 1hr Hum Rise 12% 13:03 13% 16%, 2012 3%, 2020
Max 10m Temp Fall 1.0 °C 12:32 0.7 °C 1.0 °C, 2019 0.3 °C, 2020
Max 1hr Temp Fall 1.9 °C 13:07 2.0 °C 2.6 °C, 2013 0.9 °C, 2021
Max 1hr Hum Fall 16% 14:29 12% 17%, 2013 3%, 2020
Max 10m Wind Speed 11.7 mph 15:47 10.9 mph 16.2 mph, 2016 6.7 mph, 2012
Minimum Feels-like 14.2 °C 05:03 16.9 °C 22.3 °C, 2012 7.9 °C, 2011
Maximum Feels-like 23.1 °C 15:32 25.9 °C 34.7 °C, 2012 18.1 °C, 2014
Mean Feels-like 18.4 °C 21.5 °C 28.7 °C, 2012 13.8 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.6 °C (+0.3) 8.0 °C (-0.5) 14.6 °C (+6.3), 2009 3.1 °C (-5.2), 2016
Humidity Range 43% 35% 52%, 2009 9%, 2016
Pressure Range 9 hPa 6 hPa 14 hPa, 2013 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [53%]88 hrs (76%) [34%] 10.5 [80%], 2009 0 [0%], 2020
Wet Hours 1
[Mean rain rate: 0.4 mm/h]		34 hrs (146%) [7.5%] 8, 2020 0, 2009
Cloud Cover Partly Cloudy
Events Thunder
Comments pm Showers with possible thunder
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 18.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th August 2019.
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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose