I've never had too much trouble with my 14.5 WSM in New England winter weather...including snow(2015).
Just keep it fueled...if you can, block the wind a bit(if it's an issue at all where you're at). The wind is usually the biggest challenge. Where I set mine up originally, I had to adjust for it often, but I've found a good spot for it, and my grill, that is protected a bit from the North, and East.
What are you planning to cook?
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