Daily Report for 18th December 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.2 °C (+4.1) 23:57 5.1 °C (+1.7) 12.4 °C (+9.3), 2014 -6.0 °C (-9.1), 2010
Maximum Temperature 10.4 °C (+2.8) 04:49 9.9 °C (+1.6) 13.7 °C (+6.1), 2015 0.3 °C (-7.3), 2010
Mean Temperature 9.5 °C (+3.4) 7.8 °C (+1.7) 13.0 °C, 2014 -2.5 °C, 2010
Minimum Humidity 73% 15:43 76% 87%, 2010 73%, 2018
Maximum Humidity 93% 21:32 93% 98%, 2010 82%, 2016
Mean Humidity 85% 86% 93%, 2010 81%, 2016
Minimum Pressure 1002 hPa 20:53 1008 hPa 1032 hPa, 2016 988 hPa, 2013
Maximum Pressure 1018 hPa 00:01 1018 hPa 1040 hPa, 2016 995 hPa, 2010
Mean Pressure 1009 hPa 1013 hPa 1036 hPa, 2016 992 hPa, 2010
Mean Wind Speed 8.6 mph (+3.5) 5.9 mph (+0.8) 9.8 mph, 2014 0.8 mph, 2016
Maximum Wind Speed 19.8 mph 09:05 14.7 mph 21.5 mph, 2014 4.7 mph, 2016
Maximum Gust 33.4 mph 14:09 23.9 mph 34.4 mph, 2013 6.3 mph, 2016
Mean Wind Direction S
Rainfall 3.8 mm 40.6 mm (125%) 8.0 mm, 2010
Maximum Hourly Rain 1.4 mm 18:00 4.2 mm, 2013
Maximum 10-min Rain 0.4 mm 18:00 1.3 mm, 2013
Maximum Rain Rate 1.7 mm/h 17:44 9 mm/h, 2013
Minimum Dew Point 5.4 °C 15:43 2.8 °C 10.4 °C, 2014 -7.8 °C, 2010
Maximum Dew Point 8.6 °C 00:50 7.8 °C 11.5 °C, 2014 -0.4 °C, 2009
Mean Dew Point 7.1 °C 5.5 °C 10.9 °C, 2014 -3.5 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.9 °C * 21:16 6.0 °C 12.1 °C, 2014 -6.0 °C, 2010
Day Maximum (09-21) * 10.1 °C * 13:19 9.7 °C 13.7 °C, 2015 0.3 °C, 2010
Max 10m Temp Rise 0.2 °C 00:20 0.3 °C 0.5 °C, 2010 0.2 °C, 2009
Max 1hr Temp Rise 0.5 °C 21:28 1.1 °C 1.9 °C, 2010 0.5 °C, 2014
Max 1hr Hum Rise 10% 16:57 5% 10%, 2018 2%, 2016
Max 10m Temp Fall 0.3 °C 16:29 0.3 °C 0.5 °C, 2017 0.1 °C, 2014
Max 1hr Temp Fall 1.2 °C 17:14 1.0 °C 2.0 °C, 2017 0.3 °C, 2014
Max 1hr Hum Fall 5% 14:12 6% 7%, 2013 1%, 2016
Max 10m Wind Speed 13.7 mph 14:42 11.0 mph 16.2 mph, 2013 3.2 mph, 2016
Minimum Feels-like 3.8 °C 17:39 1.9 °C 14.1 °C, 2014 -8.9 °C, 2010
Maximum Feels-like 11.0 °C 01:25 10.4 °C 15.5 °C, 2014 0.3 °C, 2010
Mean Feels-like 8.1 °C 6.5 °C 14.7 °C, 2014 -4.4 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 21 hrs, 2010 0 hrs, 2012
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.2 °C (-1.3) 4.8 °C (-0.1) 6.6 °C (+2.1), 2017 1.2 °C (-3.3), 2014
Humidity Range 20% 16% 20%, 2018 3%, 2016
Pressure Range 16 hPa 10 hPa 27 hPa, 2013 2 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]37 hrs (131%) [29%] 7 [100%], 2017 0 [0%], 2010
Wet Hours 5
[Mean rain rate: 0.8 mm/h]
43 hrs (119%) [10%] 5, 2018 0, 2011
Cloud Cover Overcast
Events None
Comments steady eve 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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