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TheWeatherOutlook says is based on computer models and the weather patterns during the autumn.
The Computer says uses raw computer model data and is updated daily.
Time is flying by and we've now reached the astronomical autumn. At this stage most of the seasonal models are forecasting above average temperatures this December, however recent updates of the CFSv2 are hinting at high latitude blocking which would increase the chance of cold spells. On balance the likelihood of snow at Christmas remains low but remember:
1) There is a long time for things to change
2) Even during milder than average winter months cold snaps can bring snow
Therefore the fourth update suggests a fractionally increased chance of snow on Christmas Day 2017. We continue to think the most likely outcome is for a mobile pattern continuing for much of December and possibly lasting through the Christmas period. That suggests predominantly unsettled weather. Incursions of colder air more likely in the north of the UK.
Update 4, 23/09/2017
Updates are usually weekly.
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