Daily Report for 18th May 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.2 °C (+0.8) 06:09 8.2 °C (+0.9) 11.4 °C (+3.0), 2011 3.9 °C (-4.5), 2018
Maximum Temperature 15.9 °C (-0.9) 12:53 17.0 °C (+1.1) 24.5 °C (+7.7), 2014 14.6 °C (-2.2), 2016
Mean Temperature 12.3 °C (-0.0) 12.3 °C (+1.0) 18.7 °C, 2014 11.7 °C, 2013
Minimum Humidity 53% 16:55 48% 71%, 2016 32%, 2020
Maximum Humidity 89% 05:05 85% 95%, 2019 75%, 2013
Mean Humidity 73% 69% 82%, 2019 56%, 2020
Minimum Pressure 1009 hPa 02:58 1014 hPa 1027 hPa, 2010 1002 hPa, 2012
Maximum Pressure 1018 hPa 23:33 1019 hPa 1030 hPa, 2010 1009 hPa, 2012
Mean Pressure 1014 hPa 1016 hPa 1028 hPa, 2010 1005 hPa, 2016
Mean Wind Speed n/a (-4.7) 0.0 mph (-4.7) 8.3, 2015 0.4, 2019
Maximum Wind Speed n/a 0.0 mph 21, 2015 5.8, 2019
Maximum Gust n/a 0.0 mph 39.8, 2015 9.2, 2019
Mean Wind Direction n/a
Rainfall trace 11.9 mm (40%) 15, 2017
Maximum Hourly Rain n/a 3.2, 2016
Maximum 10-min Rain n/a 2, 2016
Maximum Rain Rate n/a 30, 2016
Minimum Dew Point 5.3 °C 18:24 3.4 °C 8.3 °C, 2011 0.2 °C, 2015
Maximum Dew Point 8.9 °C 05:38 9.1 °C 13.6 °C, 2014 6.4 °C, 2013
Mean Dew Point 7.3 °C 6.4 °C 11.4 °C, 2011 4.9 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.2 °C 8.5 °C 13.1 °C, 2011 3.9 °C, 2018
Day Maximum (09-21) 15.9 °C 17.0 °C 24.5 °C, 2014 14.6 °C, 2016
Max 10m Temp Rise 0.7 °C 15:39 0.7 °C 0.8 °C, 2012 0.4 °C, 2011
Max 1hr Temp Rise 2.2 °C 12:45 2.3 °C 4.0 °C, 2014 1.2 °C, 2011
Max 1hr Hum Rise 6% 22:05 9% 21%, 2019 5%, 2013
Max 10m Temp Fall 0.5 °C 04:28 0.5 °C 0.7 °C, 2015 0.3 °C, 2013
Max 1hr Temp Fall 1.2 °C 21:24 1.5 °C 3.1 °C, 2019 0.9 °C, 2012
Max 1hr Hum Fall 12% 12:56 14% 22%, 2015 7%, 2016
Max 10m Wind Speed n/a 0.0 mph 18, 2015 3.4, 2019
Minimum Feels-like n/a 0.0 °C 12.1, 2014 2.6, 2018
Maximum Feels-like n/a 0.0 °C 25.1, 2014 15.2, 2013
Mean Feels-like n/a 0.0 °C 19.7, 2014 11.4, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.7 °C (-1.7) 8.7 °C (+0.2) 14.2 °C (+5.8), 2018 3.4 °C (-5.0), 2016
Humidity Range 36% 37% 58%, 2014 15%, 2016
Pressure Range 9 hPa 5 hPa 15 hPa, 2015 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5.8 [41%]94 hrs (87%) [38%] 13.5 [95%], 2014 0.1 [1%], 2016
Wet Hours 0.312 hrs (53%) [2.8%] 9, 2017 0, 2010
Cloud Cover not available
Events None
Comments occasional. Brief am SL. Showers
Extra Comments
Issues None known
Observer Absent? No
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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Wind rose