MN/WI winters have been known to hit -15 to -20 regularly, probably won't use it much below 0f. We did winterize the trailer and don't plan on using the water system.
We would only use it once a month with heat shutoff when we are not there.
I hear some people use dehumidifiers in the winter, not sure how effective that would be.
Snow can get up to 3ft but I would probably brush it off if it gets more than a foot.
We did use it last weekend and noticed a lot of ice buildup down the sides from melted snow, not sure how big of an issue that will become.