Daily Report for 31st December 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.1 °C (+4.4) 23:36 3.3 °C (+0.1) 10.6 °C (+7.9), 2011 0.4 °C (-2.3), 2014
Maximum Temperature 12.9 °C (+5.8) 06:02 8.0 °C (+0.1) 12.9 °C (+5.8), 2017 3.4 °C (-3.7), 2009
Mean Temperature 10.4 °C (+5.1) 5.7 °C (+0.1) 11.7 °C, 2011 2.5 °C, 2009
Minimum Humidity 78% 21:10 79% 88%, 2010 62%, 2015
Maximum Humidity 96% 01:10 94% 98%, 2009 83%, 2016
Mean Humidity 87% 88% 95%, 2010 74%, 2015
Minimum Pressure 992 hPa 19:31 1008 hPa 1035 hPa, 2018 992 hPa, 2017
Maximum Pressure 999 hPa 00:15 1019 hPa 1038 hPa, 2018 999 hPa, 2017
Mean Pressure 994 hPa 1013 hPa 1036 hPa, 2018 994 hPa, 2017
Mean Wind Speed 10.1 mph (+5.0) 5.8 mph (+0.7) 10.1 mph, 2017 1.5 mph, 2010
Maximum Wind Speed 22.0 mph 21:48 13.8 mph 22.0 mph, 2017 6.4 mph, 2010
Maximum Gust 34.6 mph 07:06 22.4 mph 34.6 mph, 2017 8.1 mph, 2010
Mean Wind Direction SW
Rainfall 6.4 mm 97.3 mm (174%) 6.4 mm, 2017
Maximum Hourly Rain 5.1 mm 15:27 5.1 mm, 2017
Maximum 10-min Rain 3.3 mm 15:22 3.3 mm, 2017
Maximum Rain Rate 26 mm/h 15:20 42 mm/h, 2015
Minimum Dew Point 3.9 °C 23:03 1.4 °C 9.8 °C, 2011 -1.6 °C, 2009
Maximum Dew Point 11.4 °C 03:30 6.1 °C 11.4 °C, 2017 2.5 °C, 2009
Mean Dew Point 8.3 °C 3.8 °C 10.3 °C, 2011 1.3 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.6 °C * 23:30 3.7 °C 10.1 °C, 2012 0.4 °C, 2014
Day Maximum (09-21) * 11.1 °C * 11:52 7.6 °C 12.5 °C, 2011 3.4 °C, 2009
Max 10m Temp Rise 0.3 °C 01:13 0.3 °C 0.5 °C, 2019 0.1 °C, 2009
Max 1hr Temp Rise 1.4 °C 01:33 1.1 °C 1.9 °C, 2014 0.3 °C, 2009
Max 1hr Hum Rise 6% 15:44 5% 10%, 2015 1%, 2010
Max 10m Temp Fall 0.6 °C 15:30 0.4 °C 1.0 °C, 2013 0.1 °C, 2010
Max 1hr Temp Fall 2.0 °C 16:08 1.2 °C 2.3 °C, 2013 0.3 °C, 2010
Max 1hr Hum Fall 6% 19:05 6% 9%, 2015 1%, 2016
Max 10m Wind Speed 16.0 mph 05:57 10.8 mph 16.0 mph, 2017 5.0 mph, 2010
Minimum Feels-like 1.9 °C 23:29 -1.2 °C 11.7 °C, 2011 -4.1 °C, 2009
Maximum Feels-like 14.7 °C 05:46 7.6 °C 14.7 °C, 2017 3.2 °C, 2009
Mean Feels-like 9.8 °C 3.4 °C 13.1 °C, 2011 -0.9 °C, 2009
Air-frost Hrs 0 hrs 1.0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.8 °C (+1.5) 4.7 °C (-0.0) 6.6 °C (+2.3), 2014 1.2 °C (-3.1), 2018
Humidity Range 18% 15% 26%, 2015 3%, 2016
Pressure Range 7 hPa 11 hPa 16 hPa, 2012 3 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]61 hrs (126%) [28%] 6 [85%], 2015 0 [0%], 2010
Wet Hours 4
[Mean rain rate: 1.6 mm/h]
82 hrs (133%) [11%] 7, 2012 0, 2010
Cloud Cover Overcast
Events None
Comments Rain Spells
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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