Daily Report for 9th June 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.1 °C (+1.6) 05:33 13.4 °C (+2.2) 14.7 °C (+3.2), 2014 7.0 °C (-4.5), 2015
Maximum Temperature 26.8 °C (+6.5) 16:17 23.9 °C (+4.0) 26.8 °C (+6.5), 2021 14.1 °C (-6.2), 2013
Mean Temperature 20.6 °C (+4.1) 19.0 °C (+3.1) 20.6 °C, 2021 11.2 °C, 2015
Minimum Humidity 20% 14:49 44% 72%, 2009 20%, 2021
Maximum Humidity 84% 05:48 87% 96%, 2009 75%, 2012
Mean Humidity 60% 68% 86%, 2009 55%, 2012
Minimum Pressure 1021 hPa 19:06 1020 hPa 1031 hPa, 2015 1002 hPa, 2010
Maximum Pressure 1024 hPa 00:28 1024 hPa 1033 hPa, 2015 1007 hPa, 2010
Mean Pressure 1023 hPa 1022 hPa 1032 hPa, 2015 1004 hPa, 2010
Mean Wind Speed 2.8 mph (-1.6) 2.3 mph (-2.1) 8.7 mph, 2012 1.8 mph, 2016
Maximum Wind Speed 11.2 mph 16:39 10.2 mph 18.1 mph, 2012 6.2 mph, 2016
Maximum Gust 18.2 mph 16:39 15.6 mph 27.0 mph, 2012 9.4 mph, 2016
Mean Wind Direction W
Rainfall 0.0 mm 7.4 mm (52%) 3.9 mm, 2014
Maximum Hourly Rain n/a 3, 2010
Maximum 10-min Rain n/a 2.2, 2010
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point 1.3 °C 14:41 8.9 °C 10.6 °C, 2010 1.3 °C, 2021
Maximum Dew Point 16.2 °C 22:52 15.0 °C 17.3 °C, 2023 6.0 °C, 2015
Mean Dew Point 11.6 °C 12.3 °C 13.3 °C, 2023 3.4 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.1 °C 05:33 13.6 °C 14.7 °C, 2014 7.0 °C, 2015
Day Maximum (09-21) 26.8 °C 16:20 23.9 °C 26.8 °C, 2021 14.1 °C, 2013
Max 10m Temp Rise 0.5 °C 07:13 0.6 °C 0.8 °C, 2011 0.3 °C, 2013
Max 1hr Temp Rise 2.2 °C 07:41 2.1 °C 3.0 °C, 2011 0.8 °C, 2013
Max 1hr Hum Rise 16% 16:41 9% 18%, 2014 3%, 2013
Max 10m Temp Fall 0.4 °C 16:58 0.5 °C 0.7 °C, 2014 0.3 °C, 2013
Max 1hr Temp Fall 1.5 °C 20:22 1.7 °C 2.5 °C, 2019 1.0 °C, 2010
Max 1hr Hum Fall 18% 13:14 12% 18%, 2021 5%, 2013
Max 10m Wind Speed 7.6 mph 15:56 7.7 mph 14.4 mph, 2012 4.1 mph, 2016
Minimum Feels-like 14.5 °C 05:20 15.0 °C 15.9 °C, 2014 3.9 °C, 2015
Maximum Feels-like 29.2 °C 18:18 26.6 °C 31.1 °C, 2023 14.3 °C, 2013
Mean Feels-like 23.0 °C 21.5 °C 23.0 °C, 2021 10.5 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.7 °C (+4.9) 10.5 °C (+1.8) 14.9 °C (+6.1), 2023 4.0 °C (-4.8), 2013
Humidity Range 64% 43% 64%, 2021 19%, 2013
Pressure Range 3 hPa 3 hPa 9 hPa, 2016 2 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13.5 [90%]81 hrs (141%) [60%] 13.5 [90%], 2021 0.2 [1%], 2009
Wet Hours 08 hrs (72%) [3.7%] 9, 2009 0, 2012
Cloud Cover Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 20.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 9th June 2021.
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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Webcam Summary of Cloud Conditions

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