Daily Report for 18th August 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.0 °C (+0.8) 06:48 14.6 °C (+1.1) 20.0 °C (+6.8), 2012 11.4 °C (-1.8), 2014
Maximum Temperature 23.7 °C (+1.4) 15:27 22.7 °C (+0.2) 30.0 °C (+7.7), 2012 17.1 °C (-5.2), 2011
Mean Temperature 18.4 °C (+1.1) 18.3 °C (+0.6) 25.0 °C, 2012 13.7 °C, 2011
Minimum Humidity 50% 16:52 56% 64%, 2018 40%, 2012
Maximum Humidity 85% 08:01 92% 93%, 2011 71%, 2015
Mean Humidity 68% 76% 82%, 2011 53%, 2012
Minimum Pressure 1017 hPa 17:34 1015 hPa 1020 hPa, 2018 1003 hPa, 2019
Maximum Pressure 1020 hPa 10:49 1019 hPa 1022 hPa, 2018 1010 hPa, 2010
Mean Pressure 1018 hPa 1017 hPa 1021 hPa, 2018 1006 hPa, 2019
Mean Wind Speed 3.5 mph (-0.5) 3.4 mph (-0.6) 6.3 mph, 2017 3.1 mph, 2016
Maximum Wind Speed 9.2 mph 9.3 mph 16.1 mph, 2019 9.2 mph, 2009
Maximum Gust 13.6 mph 11:52 13.4 mph 26.5 mph, 2019 13.6 mph, 2009
Mean Wind Direction SW
Rainfall 0.0 mm 37.8 mm (123%) 14.6 mm, 2011
Maximum Hourly Rain n/a 9.9, 2017
Maximum 10-min Rain n/a 5.9, 2017
Maximum Rain Rate n/a 66, 2017
Minimum Dew Point 11.0 °C 10:36 11.2 °C 14.4 °C, 2020 5.6 °C, 2014
Maximum Dew Point 14.4 °C 14:26 16.0 °C 17.0 °C, 2020 10.5 °C, 2014
Mean Dew Point 12.2 °C 13.6 °C 15.6 °C, 2020 8.6 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.0 °C 14.7 °C 20.0 °C, 2012 11.4 °C, 2014
Day Maximum (09-21) 23.7 °C 22.7 °C 30.0 °C, 2012 17.1 °C, 2011
Max 10m Temp Rise n/a 10:46 0.5 °C 0.8, 2017 0.3, 2011
Max 1hr Temp Rise n/a 11:36 1.4 °C 2.8, 2010 1, 2018
Max 1hr Hum Rise n/a 21:00 6% 20, 2017 5, 2018
Max 10m Temp Fall n/a 10:36 0.5 °C 2.9, 2017 0.2, 2015
Max 1hr Temp Fall n/a 10:36 1.3 °C 4.4, 2017 0.6, 2015
Max 1hr Hum Fall n/a 09:40 7% 15, 2016 6, 2015
Max 10m Wind Speed 6.1 mph 17:58 6.4 mph 12.3 mph, 2019 6.1 mph, 2009
Minimum Feels-like 15.3 °C 10:36 16.1 °C 22.9 °C, 2012 11.5 °C, 2014
Maximum Feels-like 26.7 °C 15:13 25.1 °C 34.9 °C, 2012 18.7 °C, 2011
Mean Feels-like 20.7 °C 20.4 °C 28.7 °C, 2012 15.3 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.7 °C (+0.7) 8.1 °C (-0.9) 10.0 °C (+1.0), 2012 4.9 °C (-4.1), 2015
Humidity Range 35% 36% 50%, 2010 20%, 2018
Pressure Range 3 hPa 3 hPa 7 hPa, 2019 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [38%]81 hrs (74%) [33%] 12 [91%], 2012 0 [0%], 2011
Wet Hours 014 hrs (63%) [3.2%] 3, 2019 0, 2009
Cloud Cover not available
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
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, Wet hrs, Cloud cover and Events are based on manual equipment/observations (entered with a delay of 1-10 days); their reliablity is questionable and they are provided for interest only.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions


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Wind rose