December 2013 - Sunshine Recovery

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December 2013 - Sunshine Recovery

Postby Nick Gardner » 2013 Dec 30, 11:49

After a rather dull mid-December period (12th - 23rd with only 16 hours), sunshine levels are recovering (helped by unbroken sunshine all day on the 29th) and the monthly total (1st - 29th) now stands at 76 hours.

After early rain the sunshine has returned again today.

December sunshine:
2012 = 83 hours
2011 = 65 hours
2010 = 91 hours
2009 = 99 hours
2008 = 113 hours
2007 = 69 hours

Might surpass last year's December sunshine total though 2008's 113 hours won't be beaten this year.
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
Nick Gardner
 
Posts: 429
Joined: 2012 Jan 27, 17:25
Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.

Re: December 2013 - Sunshine Recovery

Postby greg_gruner » 2013 Dec 30, 14:48

It's often the case that high rainfall and high sunshine go together in an English winter. The gaps between the fronts in a mobile westerly pattern are often clear, whereas anticyclones bring persistent low cloud or fog.
Today was a good example - rain all morning and sunshine since 1230
Greg Gruner
Farnborough, Hampshire
greg_gruner
 
Posts: 224
Joined: 2012 Feb 04, 17:28

Re: December 2013 - Sunshine Recovery

Postby Nick Gardner » 2013 Dec 30, 18:19

Rain cleared by 9:30 and the sun was out by 10:00. Virtually unbroken sunshine from then onwards with a total of 5.2 hours.

I've added rainfall to the December sunshine totals:

December sunshine vs rainfall:
2013 = 81 hours; 118 mm (1st - 30th)
2012 = 83 hours; 172 mm
2011 = 65 hours; 80 mm
2010 = 91 hours; 32 mm
2009 = 99 hours; 86 mm
2008 = 113 hours; 79 mm
2007 = 69 hours; 73 mm.

I remember Philip Eden once saying that the sunniest Decembers were often westerly and mild. Difficult to see a strong pattern of high rainfall and high sunshine levels but my dataset is rather short.
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
Nick Gardner
 
Posts: 429
Joined: 2012 Jan 27, 17:25
Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.

Re: December 2013 - Sunshine Recovery

Postby greg_gruner » 2013 Dec 30, 21:11

I suspect that the sun and rain positive correlation applies more to the east and south-east. I did some correlation figures for Wokingham, and got a positive correlation for most winter months. Anticyclonic gloom is more prevalent in the east - certainly your 91 hours in the cold and dry December 2010 was not even approached in the south-east (more like 30 hours).
Greg Gruner
Farnborough, Hampshire
greg_gruner
 
Posts: 224
Joined: 2012 Feb 04, 17:28

Re: December 2013 - Sunshine Recovery

Postby Nick Gardner » 2013 Dec 31, 13:44

December 2010 had a total of 10 cloudless days and 9 sunless days (consecutively cloudy from the 27th - 31st!). December 2013 has had only 1 cloudless day and 8 sunless days.

Sunless & cloudless December Days:
2013 = 8 & 1
2012 = 9 & 4
2011 = N/A
2010 = 9 & 10
2009 = 6 & 4
2008 = 3 & 8
2007 = 4 & 4
2006 = 4 & 4
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
Nick Gardner
 
Posts: 429
Joined: 2012 Jan 27, 17:25
Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.


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