Daily Report for 22nd June 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 18.9 °C (+6.4) 23:59 14.1 °C (+2.3) 18.9 °C (+6.4), 2017 9.8 °C (-2.7), 2019
Maximum Temperature 25.1 °C (+3.6) 00:00 24.4 °C (+3.8) 28.6 °C (+7.1), 2010 16.2 °C (-5.3), 2021
Mean Temperature 22.1 °C (+5.0) 19.4 °C (+3.1) 22.1 °C, 2017 13.3 °C, 2021
Minimum Humidity 53% 13:57 44% 72%, 2016 31%, 2010
Maximum Humidity 73% 08:34 79% 97%, 2013 73%, 2017
Mean Humidity 63% 62% 80%, 2016 56%, 2018
Minimum Pressure 1010 hPa 00:09 1012 hPa 1030 hPa, 2018 1004 hPa, 2013
Maximum Pressure 1015 hPa 23:01 1019 hPa 1032 hPa, 2018 1011 hPa, 2011
Mean Pressure 1012 hPa 1016 hPa 1031 hPa, 2018 1007 hPa, 2013
Mean Wind Speed 5.5 mph (+1.1) 4.8 mph (+0.4) 8.9 mph, 2013 1.9 mph, 2022
Maximum Wind Speed 13.4 mph 15:33 12.5 mph 22.3 mph, 2012 9.0 mph, 2018
Maximum Gust 21.0 mph 08:24 18.7 mph 32.0 mph, 2012 11.2 mph, 2014
Mean Wind Direction W
Rainfall 0.0 mm 29.0 mm (84%) 5.2 mm, 2011
Maximum Hourly Rain n/a 3, 2011
Maximum 10-min Rain n/a 1.1, 2011
Maximum Rain Rate n/a 18, 2015
Minimum Dew Point 13.0 °C 13:33 9.0 °C 13.0 °C, 2017 3.9 °C, 2018
Maximum Dew Point 16.9 °C 00:13 13.8 °C 17.8 °C, 2023 9.9 °C, 2018
Mean Dew Point 14.6 °C 11.5 °C 15.3 °C, 2023 7.3 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 20.2 °C * 08:14 14.2 °C 20.2 °C, 2017 9.8 °C, 2019
Day Maximum (09-21) * 23.7 °C * 15:23 24.4 °C 28.6 °C, 2010 16.2 °C, 2021
Max 10m Temp Rise 0.7 °C 11:42 0.6 °C 0.9 °C, 2019 0.5 °C, 2009
Max 1hr Temp Rise 1.7 °C 12:11 2.3 °C 3.9 °C, 2019 1.5 °C, 2016
Max 1hr Hum Rise 5% 22:56 9% 25%, 2018 5%, 2009
Max 10m Temp Fall 0.4 °C 21:17 0.5 °C 0.8 °C, 2023 0.3 °C, 2009
Max 1hr Temp Fall 1.1 °C 21:17 1.8 °C 2.9 °C, 2018 1.1 °C, 2012
Max 1hr Hum Fall 9% 12:00 10% 21%, 2019 5%, 2016
Max 10m Wind Speed 10.3 mph 12:19 9.2 mph 14.2 mph, 2012 6.3 mph, 2022
Minimum Feels-like 21.9 °C 23:52 15.3 °C 21.9 °C, 2017 8.3 °C, 2018
Maximum Feels-like 30.1 °C 00:11 26.9 °C 32.5 °C, 2023 17.2 °C, 2021
Mean Feels-like 25.8 °C 21.5 °C 25.8 °C, 2017 14.1 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.2 °C (-2.8) 10.3 °C (+1.4) 15.7 °C (+6.7), 2010 5.4 °C (-3.7), 2021
Humidity Range 20% 35% 54%, 2019 13%, 2016
Pressure Range 5 hPa 7 hPa 13 hPa, 2012 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [26%]175 hrs (124%) [53%] 15.2 [100%], 2018 0.5 [3%], 2013
Wet Hours 019 hrs (69%) [3.6%] 4, 2013 0, 2009
Cloud Cover am: Hazy transitioned to Mostly Cloudy
pm: Partly Cloudy or Mostly 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 22nd June 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

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Webcam Summary of Cloud Conditions

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Wind rose