Daily Report for 17th July 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.9 °C (+0.3) 22:48 14.0 °C (+1.0) 18.7 °C (+5.1), 2016 12.8 °C (-0.8), 2011
Maximum Temperature 18.4 °C (-4.2) 13:03 22.4 °C (+0.2) 31.2 °C (+8.6), 2013 18.4 °C (-4.2), 2009
Mean Temperature 15.6 °C (-1.9) 17.5 °C (+0.6) 24.7 °C, 2013 15.6 °C, 2009
Minimum Humidity 71% 13:37 52% 71%, 2009 29%, 2013
Maximum Humidity 96% 08:40 89% 96%, 2009 71%, 2013
Mean Humidity 88% 73% 88%, 2009 45%, 2013
Minimum Pressure 1003 hPa 11:08 1009 hPa 1021 hPa, 2013 993 hPa, 2011
Maximum Pressure 1008 hPa 12:00 1014 hPa 1025 hPa, 2010 996 hPa, 2011
Mean Pressure 1006 hPa 1012 hPa 1024 hPa, 2013 994 hPa, 2011
Mean Wind Speed n/a (-4.3) 0.0 mph (-4.3) 7.1, 2011 2.2, 2017
Maximum Wind Speed n/a 0.0 mph 16.6, 2016 7.3, 2017
Maximum Gust n/a 0.0 mph 25.8, 2016 10.5, 2017
Mean Wind Direction n/a
Rainfall 2.5 mm 35.9 mm (156%) 3.3 mm, 2011
Maximum Hourly Rain 1.4 mm 19:09 1.6 mm, 2011
Maximum 10-min Rain 0.8 mm 18:53 1.1 mm, 2011
Maximum Rain Rate 4.1 mm/h 18:53 50 mm/h, 2011
Minimum Dew Point 11.7 °C 23:39 9.7 °C 13.6 °C, 2016 4.2 °C, 2010
Maximum Dew Point 15.3 °C 09:30 15.1 °C 18.0 °C, 2016 12.7 °C, 2010
Mean Dew Point 13.5 °C 12.3 °C 15.8 °C, 2016 9.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 14.7 °C * 14.0 °C 18.7 °C, 2016 12.8 °C, 2011
Day Maximum (09-21) 18.4 °C 22.4 °C 31.2 °C, 2013 18.4 °C, 2009
Max 10m Temp Rise 1.6 °C 13:03 0.7 °C 1.6 °C, 2009 0.4 °C, 2017
Max 1hr Temp Rise 2.1 °C 12:58 1.6 °C 3.7 °C, 2013 1.7 °C, 2011
Max 1hr Hum Rise 9% 19:19 7% 17%, 2019 5%, 2010
Max 10m Temp Fall 1.1 °C 12:53 0.6 °C 1.1 °C, 2009 0.3 °C, 2012
Max 1hr Temp Fall 1.6 °C 18:45 1.3 °C 2.4 °C, 2013 1.1 °C, 2012
Max 1hr Hum Fall 9% 13:09 7% 19%, 2015 7%, 2014
Max 10m Wind Speed 4.7 mph 0.7 mph 14.2 mph, 2015 4.7 mph, 2009
Minimum Feels-like n/a 0.0 °C 23.2, 2016 13.9, 2011
Maximum Feels-like n/a 0.0 °C 33.3, 2013 21.9, 2011
Mean Feels-like n/a 0.0 °C 26.8, 2016 17.6, 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 4.5 °C (-4.5) 8.4 °C (-0.9) 14.5 °C (+5.5), 2013 4.5 °C (-4.5), 2009
Humidity Range 25% 37% 45%, 2010 21%, 2011
Pressure Range 5 hPa 5 hPa 11 hPa, 2010 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [10%]91 hrs (88%) [36%] 11 [75%], 2017 1.5 [10%], 2009
Wet Hours 3
[Mean rain rate: 0.8 mm/h]
26 hrs (138%) [6.3%] 3, 2009 0, 2010
Cloud Cover not available
Events None
Comments Light 9-10,13-15 Showers; Moderate-Light 18-20 Rain
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