Daily Report for 20th August 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.1 °C (-2.8) 06:29 13.4 °C (-0.9) 18.4 °C (+4.5), 2018 8.6 °C (-5.3), 2014
Maximum Temperature 21.1 °C (-1.3) 16:06 21.4 °C (-1.4) 24.9 °C (+2.5), 2012 18.9 °C (-3.5), 2014
Mean Temperature 16.0 °C (-2.0) 17.3 °C (-1.2) 21.7 °C, 2018 13.8 °C, 2014
Minimum Humidity 44% 16:03 50% 72%, 2010 34%, 2013
Maximum Humidity 80% 23:34 81% 94%, 2020 80%, 2013
Mean Humidity 63% 66% 84%, 2015 56%, 2013
Minimum Pressure 1020 hPa 00:04 1014 hPa 1026 hPa, 2013 1000 hPa, 2020
Maximum Pressure 1023 hPa 16:20 1019 hPa 1028 hPa, 2013 1005 hPa, 2020
Mean Pressure 1022 hPa 1016 hPa 1027 hPa, 2013 1004 hPa, 2020
Mean Wind Speed 3.8 mph (-0.2) 4.4 mph (+0.4) 13.5 mph, 2016 2.0 mph, 2021
Maximum Wind Speed 10.2 mph 21:00 12.2 mph 26.4 mph, 2016 7.8 mph, 2013
Maximum Gust 15.7 mph 10:36 18.8 mph 45.2 mph, 2016 10.2 mph, 2013
Mean Wind Direction W
Rainfall 3.3 mm 72.6 mm (208%) 4.6 mm, 2011
Maximum Hourly Rain 2.0 mm 22:44 3.6 mm, 2011
Maximum 10-min Rain 0.8 mm 21:58 1.4 mm, 2011
Maximum Rain Rate 12 mm/h 21:21 15 mm/h, 2011
Minimum Dew Point 6.4 °C 00:47 7.6 °C 15.6 °C, 2018 2.6 °C, 2014
Maximum Dew Point 11.0 °C 23:34 13.0 °C 19.2 °C, 2020 8.6 °C, 2014
Mean Dew Point 8.7 °C 10.4 °C 16.6 °C, 2018 5.3 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.1 °C 06:29 13.5 °C 18.4 °C, 2018 8.6 °C, 2014
Day Maximum (09-21) 21.1 °C 16:06 21.4 °C 24.9 °C, 2012 18.9 °C, 2014
Max 10m Temp Rise 0.6 °C 10:23 0.6 °C 0.7 °C, 2013 0.4 °C, 2010
Max 1hr Temp Rise 2.4 °C 10:23 2.1 °C 2.9 °C, 2013 1.2 °C, 2010
Max 1hr Hum Rise 10% 19:23 8% 12%, 2011 4%, 2010
Max 10m Temp Fall 0.4 °C 19:17 0.6 °C 0.8 °C, 2016 0.2 °C, 2010
Max 1hr Temp Fall 1.8 °C 19:34 1.8 °C 3.2 °C, 2013 0.4 °C, 2010
Max 1hr Hum Fall 11% 10:44 10% 15%, 2013 2%, 2010
Max 10m Wind Speed 8.0 mph 21:24 9.1 mph 21.9 mph, 2016 6.3 mph, 2013
Minimum Feels-like 11.1 °C 06:08 14.2 °C 22.7 °C, 2018 6.9 °C, 2014
Maximum Feels-like 21.8 °C 14:56 23.3 °C 31.1 °C, 2018 18.9 °C, 2014
Mean Feels-like 16.8 °C 18.8 °C 26.7 °C, 2018 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 10.0 °C (+1.6) 8.0 °C (-0.5) 13.1 °C (+4.7), 2013 4.2 °C (-4.2), 2010
Humidity Range 36% 32% 50%, 2020 16%, 2010
Pressure Range 3 hPa 6 hPa 8 hPa, 2009 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [54%]113 hrs (93%) [42%] 11 [84%], 2020 0.2 [2%], 2015
Wet Hours 4
[Mean rain rate: 0.8 mm/h]
32 hrs (128%) [6.6%] 4, 2017 0, 2009
Cloud Cover am: Sunny
pm: Mostly Cloudy transitioned to Overcast
Events None
Comments 19- Rain
Extra Comments
Issues Rn data from N16
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 20th August 2017.
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