Snow is good insulation I used to worry about them not having enough air but if you look MOST of the time there will bee a space at the entrance where the snow is metled away but I still like to brush it away from the entrance.
Even when the hives are buried deep in snow there's no proble,. I've seen snow so deep as to bury 3 story colonies so I couldn't even find the apiary. Took probing with a long handled shovel to find the hives. Couldn't find some until snow melt. Upon digging them out, I found a chamber...an air pocket melted around each colony with a little chimney up to the surface.
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