Daily Report for 22nd June 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.3 °C (-0.2) 04:58 10.8 °C (-1.0) 18.9 °C (+6.4), 2017 9.8 °C (-2.7), 2019
Maximum Temperature 18.1 °C (-3.4) 18:46 19.2 °C (-1.4) 28.6 °C (+7.1), 2010 16.2 °C (-5.3), 2021
Mean Temperature 15.2 °C (-1.8) 15.0 °C (-1.2) 22.1 °C, 2017 13.3 °C, 2021
Minimum Humidity 64% 10:30 50% 72%, 2016 31%, 2010
Maximum Humidity 89% 14:45 87% 97%, 2013 73%, 2017
Mean Humidity 73% 70% 80%, 2016 56%, 2018
Minimum Pressure 1007 hPa 12:16 1011 hPa 1030 hPa, 2018 1004 hPa, 2013
Maximum Pressure 1011 hPa 23:19 1017 hPa 1032 hPa, 2018 1011 hPa, 2011
Mean Pressure 1009 hPa 1014 hPa 1031 hPa, 2018 1007 hPa, 2013
Mean Wind Speed 7.1 mph (+2.7) 5.3 mph (+0.9) 8.9 mph, 2013 1.9 mph, 2022
Maximum Wind Speed 17.0 mph 14.2 mph 22.3 mph, 2012 9.0 mph, 2018
Maximum Gust 24.6 mph 12:49 20.7 mph 32.0 mph, 2012 11.2 mph, 2014
Mean Wind Direction SW
Rainfall 5.2 mm 72.3 mm (210%) 5.2 mm, 2011
Maximum Hourly Rain 3.0 mm 14:07 3.0 mm, 2011
Maximum 10-min Rain 1.1 mm 13:28 1.1 mm, 2011
Maximum Rain Rate 10 mm/h 13:19 18 mm/h, 2015
Minimum Dew Point 7.3 °C 00:23 6.1 °C 13.0 °C, 2017 3.9 °C, 2018
Maximum Dew Point 13.4 °C 15:25 11.9 °C 17.8 °C, 2023 9.9 °C, 2018
Mean Dew Point 10.4 °C 9.2 °C 15.3 °C, 2023 7.3 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.3 °C 04:50 11.0 °C 20.2 °C, 2017 9.8 °C, 2019
Day Maximum (09-21) 18.1 °C 18:45 19.1 °C 28.6 °C, 2010 16.2 °C, 2021
Max 10m Temp Rise 0.5 °C 14:41 0.6 °C 0.9 °C, 2019 0.5 °C, 2009
Max 1hr Temp Rise 1.7 °C 08:57 2.4 °C 3.9 °C, 2019 1.5 °C, 2016
Max 1hr Hum Rise 11% 13:36 10% 25%, 2018 5%, 2009
Max 10m Temp Fall 0.7 °C 12:58 0.6 °C 0.8 °C, 2023 0.3 °C, 2009
Max 1hr Temp Fall 2.8 °C 13:33 1.8 °C 2.9 °C, 2018 1.1 °C, 2012
Max 1hr Hum Fall 16% 15:51 10% 21%, 2019 5%, 2016
Max 10m Wind Speed 11.5 mph 16:44 9.6 mph 14.2 mph, 2012 6.3 mph, 2022
Minimum Feels-like 13.2 °C 04:48 10.6 °C 21.9 °C, 2017 8.3 °C, 2018
Maximum Feels-like 20.6 °C 17:26 20.5 °C 32.5 °C, 2023 17.2 °C, 2021
Mean Feels-like 16.7 °C 16.0 °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 5.8 °C (-3.2) 8.4 °C (-0.5) 15.7 °C (+6.7), 2010 5.4 °C (-3.7), 2021
Humidity Range 25% 37% 54%, 2019 13%, 2016
Pressure Range 4 hPa 6 hPa 13 hPa, 2012 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [26%]123 hrs (86%) [37%] 15.2 [100%], 2018 0.5 [3%], 2013
Wet Hours 3
[Mean rain rate: 1.7 mm/h]
54 hrs (197%) [10%] 4, 2013 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Overcast transitioned to Mostly Sunny
Events None
Comments 12-15 Moderate/Heavy Rain
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 2011.
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

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Webcam Summary of Cloud Conditions

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Wind rose