I'm in Maine, and my 3 has lived outside in a temporary carport for the last 5 ½ yrs. It's doing great. No issues, minimal battery deg. Everyone tells me the battery likes it cold.
Strangely, before Maine, I lived north of Montreal in Quebec province, as a boy, over 50yrs ago, and garages were not at all common. And heated garages, I don't remember any. I remember driving around on a skidoo right down the main roads when it was really snowy, and going thru red lights after midnight, cause dad said it was optional. Maybe there's a difference between the big city and small towns, but no, I don't remember heated garages.