It doesn't snow where I live so I'll have to let others answer your question about that (which they have very well). But I do want to say hello and glad you joined us!
I agree.Hi there
There are some lovely articles in this section of the learning centre on keeping your chickens through the winter ~https://www.backyardchickens.com/a/housing-and-feeding-your-chickens
Keeping your coop clean, dry, draft free but well ventilated should keep them snug. Chickens are remarkably hardy when it comes to the winter. Also plenty of clean fresh water amd food available and they should be good.
Hope you find the articles helpful