Tom Lister (carl from ED) said that they had trouble filming the fire scenes due to the heavy snow, which means they should have some in about the second week of january
EE is filmed 8 weeks in advance so the first lot of snow should hit around late Jan/early Feb... although I saw on the webcams that they cleared up most of the snow so I'm not sure if it'll show in the scenes, and the next lot will be towards the end of Feb.
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The vicar will be struggling to get in the church through a blizzard while across the road Betty will still be picking blackberries in her garden.