Daily Report for 7th June 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (-3.5) 08:25 9.3 °C (-1.8) 15.1 °C (+3.8), 2014 7.8 °C (-3.5), 2009
Maximum Temperature 16.7 °C (-3.4) 14:24 18.8 °C (-1.0) 25.1 °C (+5.0), 2016 16.7 °C (-3.4), 2009
Mean Temperature 11.5 °C (-3.4) 14.0 °C (-1.4) 19.8 °C, 2021 11.5 °C, 2009
Minimum Humidity 57% 15:46 49% 71%, 2012 33%, 2015
Maximum Humidity 96% 09:59 84% 96%, 2009 74%, 2015
Mean Humidity 81% 67% 83%, 2012 51%, 2015
Minimum Pressure 998 hPa 05:05 1012 hPa 1029 hPa, 2015 993 hPa, 2012
Maximum Pressure 1004 hPa 23:40 1017 hPa 1032 hPa, 2015 1003 hPa, 2012
Mean Pressure 1001 hPa 1015 hPa 1031 hPa, 2015 998 hPa, 2012
Mean Wind Speed 3.8 mph (-0.6) 3.8 mph (-0.6) 9.0 mph, 2017 0.8 mph, 2016
Maximum Wind Speed n/a 0.0 mph 19, 2012 8.7, 2015
Maximum Gust 17.0 mph 17.9 mph 26.8 mph, 2012 12.1 mph, 2015
Mean Wind Direction n/a
Rainfall 19.2 mm 26.0 mm (237%) 19.2 mm, 2009
Maximum Hourly Rain 8.3 mm 07:41 8.3 mm, 2009
Maximum 10-min Rain 2.8 mm 07:05 2.8 mm, 2009
Maximum Rain Rate 66 mm/h 19:52 66 mm/h, 2009
Minimum Dew Point 6.5 °C 00:03 4.7 °C 11.3 °C, 2021 1.0 °C, 2015
Maximum Dew Point 11.0 °C 13:52 10.5 °C 17.0 °C, 2014 7.6 °C, 2015
Mean Dew Point 8.1 °C 7.5 °C 13.7 °C, 2021 4.2 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.8 °C 9.9 °C 15.1 °C, 2014 7.8 °C, 2009
Day Maximum (09-21) 16.7 °C 18.8 °C 25.1 °C, 2016 16.7 °C, 2009
Max 10m Temp Rise 1.1 °C 13:38 0.7 °C 1.8 °C, 2010 0.5 °C, 2016
Max 1hr Temp Rise 3.8 °C 14:23 2.5 °C 3.8 °C, 2009 1.6 °C, 2012
Max 1hr Hum Rise 7% 16:44 6% 20%, 2015 5%, 2018
Max 10m Temp Fall 1.2 °C 07:09 0.6 °C 1.7 °C, 2010 0.3 °C, 2012
Max 1hr Temp Fall 2.3 °C 08:00 1.7 °C 3.1 °C, 2016 1.2 °C, 2012
Max 1hr Hum Fall 18% 14:44 11% 18%, 2009 6%, 2017
Max 10m Wind Speed n/a 0.0 mph 13.4, 2017 5.6, 2015
Minimum Feels-like n/a 0.0 °C 17.5, 2021 5.3, 2020
Maximum Feels-like n/a 0.0 °C 28.1, 2016 19.4, 2011
Mean Feels-like n/a 0.0 °C 23, 2021 12.9, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.9 °C (+0.1) 9.5 °C (+0.8) 13.2 °C (+4.4), 2016 4.9 °C (-3.9), 2012
Humidity Range 39% 35% 44%, 2014 17%, 2018
Pressure Range 6 hPa 5 hPa 13 hPa, 2019 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4.5 [30%]45 hrs (101%) [43%] 12 [80%], 2015 0.4 [3%], 2018
Wet Hours 6
[Mean rain rate: 3.2 mm/h]
18 hrs (208%) [11%] 6, 2009 0, 2011
Cloud Cover not available
Events Light Thunderstorm
Comments 07 Thunderstormtorm (SLight); 02-0830 Moderate/Heavy/Torrential Rain
Extra Comments 4 IC sheet flashes observed (2 overhead); Thunder: 5
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 7th 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.
View monthly summary

Daily Graph of Conditions

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose