Daily Report for 22nd June 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.3 °C (+0.8) 05:51 10.6 °C (-1.1) 18.9 °C (+6.4), 2017 9.8 °C (-2.7), 2019
Maximum Temperature 21.0 °C (-0.5) 14:13 19.8 °C (-0.9) 28.6 °C (+7.1), 2010 16.2 °C (-5.3), 2021
Mean Temperature 17.2 °C (+0.2) 15.0 °C (-1.0) 22.1 °C, 2017 13.3 °C, 2021
Minimum Humidity 55% 14:53 49% 72%, 2016 31%, 2010
Maximum Humidity 83% 07:10 86% 97%, 2013 73%, 2017
Mean Humidity 68% 68% 80%, 2016 56%, 2018
Minimum Pressure 1026 hPa 03:24 1014 hPa 1030 hPa, 2018 1004 hPa, 2013
Maximum Pressure 1029 hPa 23:47 1019 hPa 1032 hPa, 2018 1011 hPa, 2011
Mean Pressure 1028 hPa 1017 hPa 1031 hPa, 2018 1007 hPa, 2013
Mean Wind Speed 3.6 mph (-0.8) 4.0 mph (-0.4) 8.9 mph, 2013 1.9 mph, 2022
Maximum Wind Speed n/a 0.0 mph 22.3, 2012 9, 2018
Maximum Gust 19.0 mph 19.5 mph 32.0 mph, 2012 11.2 mph, 2014
Mean Wind Direction n/a
Rainfall 0.0 mm 34.7 mm (101%) 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 9.6 °C 23:55 6.1 °C 13.0 °C, 2017 3.9 °C, 2018
Maximum Dew Point 13.3 °C 11:13 11.5 °C 17.8 °C, 2023 9.9 °C, 2018
Mean Dew Point 11.2 °C 8.7 °C 15.3 °C, 2023 7.3 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.3 °C 10.8 °C 20.2 °C, 2017 9.8 °C, 2019
Day Maximum (09-21) 21.0 °C 19.8 °C 28.6 °C, 2010 16.2 °C, 2021
Max 10m Temp Rise 0.5 °C 10:19 0.8 °C 0.9 °C, 2019 0.5 °C, 2009
Max 1hr Temp Rise 2.0 °C 11:15 2.4 °C 3.9 °C, 2019 1.5 °C, 2016
Max 1hr Hum Rise 5% 20:27 8% 25%, 2018 5%, 2009
Max 10m Temp Fall 0.3 °C 21:46 0.5 °C 0.8 °C, 2023 0.3 °C, 2009
Max 1hr Temp Fall 1.4 °C 23:54 1.6 °C 2.9 °C, 2018 1.1 °C, 2012
Max 1hr Hum Fall 9% 11:26 12% 21%, 2019 5%, 2016
Max 10m Wind Speed n/a 0.0 mph 14.2, 2012 6.3, 2022
Minimum Feels-like n/a 0.0 °C 21.9, 2017 8.3, 2018
Maximum Feels-like n/a 0.0 °C 32.5, 2023 17.2, 2021
Mean Feels-like n/a 0.0 °C 25.8, 2017 14.1, 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 7.7 °C (-1.3) 9.2 °C (+0.3) 15.7 °C (+6.7), 2010 5.4 °C (-3.7), 2021
Humidity Range 28% 37% 54%, 2019 13%, 2016
Pressure Range 3 hPa 5 hPa 13 hPa, 2012 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]119 hrs (84%) [36%] 15.2 [100%], 2018 0.5 [3%], 2013
Wet Hours 033 hrs (123%) [6.3%] 4, 2013 0, 2009
Cloud Cover not available
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 22nd June 2009.
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

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose