Daily Report for 19th June 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.5 °C (-0.7) 02:55 13.9 °C (+2.3) 18.4 °C (+6.2), 2017 8.2 °C (-4.0), 2010
Maximum Temperature 15.8 °C (-5.5) 15:29 23.9 °C (+3.4) 31.9 °C (+10.6), 2017 14.3 °C (-7.0), 2010
Mean Temperature 13.3 °C (-3.1) 19.1 °C (+2.8) 25.7 °C, 2017 11.5 °C, 2010
Minimum Humidity 80% 13:37 53% 80%, 2021 35%, 2017
Maximum Humidity 94% 04:11 88% 94%, 2021 71%, 2015
Mean Humidity 90% 72% 90%, 2021 54%, 2017
Minimum Pressure 1011 hPa 23:55 1018 hPa 1022 hPa, 2014 1005 hPa, 2011
Maximum Pressure 1017 hPa 06:19 1023 hPa 1025 hPa, 2024 1011 hPa, 2019
Mean Pressure 1015 hPa 1020 hPa 1023 hPa, 2018 1009 hPa, 2019
Mean Wind Speed 2.0 mph (-2.4) 2.8 mph (-1.6) 6.7 mph, 2011 1.3 mph, 2019
Maximum Wind Speed 7.5 mph 18:45 10.1 mph 16.6 mph, 2020 7.4 mph, 2017
Maximum Gust 11.4 mph 00:08 15.7 mph 26.5 mph, 2020 10.5 mph, 2017
Mean Wind Direction ENE
Rainfall trace 36.8 mm (124%) 5.5, 2019
Maximum Hourly Rain n/a 4.6, 2019
Maximum 10-min Rain n/a 2.6, 2019
Maximum Rain Rate n/a 26, 2019
Minimum Dew Point 10.6 °C 02:55 10.6 °C 14.0 °C, 2018 2.5 °C, 2010
Maximum Dew Point 12.9 °C 16:52 15.9 °C 17.5 °C, 2013 8.2 °C, 2010
Mean Dew Point 11.7 °C 13.4 °C 15.5 °C, 2018 5.5 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.5 °C 02:25 14.2 °C 18.4 °C, 2017 8.2 °C, 2010
Day Maximum (09-21) 15.8 °C 15:29 23.7 °C 31.9 °C, 2017 14.3 °C, 2010
Max 10m Temp Rise 0.4 °C 13:09 0.6 °C 0.8 °C, 2009 0.4 °C, 2019
Max 1hr Temp Rise 1.2 °C 13:31 2.2 °C 3.5 °C, 2014 1.2 °C, 2021
Max 1hr Hum Rise 5% 17:21 9% 14%, 2022 4%, 2010
Max 10m Temp Fall 0.3 °C 13:49 0.5 °C 0.8 °C, 2024 0.3 °C, 2021
Max 1hr Temp Fall 0.9 °C 18:06 1.8 °C 2.4 °C, 2012 0.9 °C, 2021
Max 1hr Hum Fall 5% 11:39 11% 13%, 2009 5%, 2021
Max 10m Wind Speed 5.1 mph 16:01 7.5 mph 13.4 mph, 2020 4.2 mph, 2017
Minimum Feels-like 13.1 °C 01:11 15.9 °C 22.1 °C, 2017 6.0 °C, 2022
Maximum Feels-like 18.4 °C 15:29 27.6 °C 36.0 °C, 2017 14.3 °C, 2010
Mean Feels-like 15.4 °C 22.2 °C 29.7 °C, 2017 11.3 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.3 °C (-4.7) 9.9 °C (+1.1) 13.5 °C (+4.5), 2017 4.3 °C (-4.7), 2021
Humidity Range 14% 35% 45%, 2012 14%, 2021
Pressure Range 6 hPa 4 hPa 9 hPa, 2011 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]144 hrs (118%) [51%] 14 [93%], 2017 0 [0%], 2021
Wet Hours 0.530 hrs (126%) [6.5%] 4, 2019 0, 2009
Cloud Cover Overcast
Events None
Comments eve rn spots
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 18.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th 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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