Power outages.If you're really worried... is there any reason you couldn't keep a small block heater (like a sump oil heater) under the engine plugged in and running over winter?? All it needs to do is keep the chill off..
Besides, it would keep you toasty warm and allow you to get a few odd jobs attended to.
If you store the boat in the water, the bottom of the hull isn't going to go down below freezing temps, so it will ironically retain more heat than when on the hard. Up on stands, the hull and interior will cool very quickly in cold windy conditions. Get below zero F and everything freezes quickly.Righto.. Still, even if the power goes out for a bit, perhaps the boat might stay warm enough to survive until the power comes back on?
(..or maybe not - I confess I've seen snow on a few occasions but really have no concept of life in any environment colder than zero. )