There's a Minnesotan on the Pedego Owners Group forum (Facebook) who does not have a car and rides her ebike year round. She works in some kind of transportation capacity for the state of Minnesota. She's been commuting in the winter on her ebike in Minnesota for years.
I just looked up and read her posts. She commuted for 6 years on an iZip, and got a Pedego to use as her "summer" bike, but decided to switch to riding it year round. She uses studded tires in the winter, and regularly uses fresh water to rinse vulnerable areas of the bike.
If you join the Pedego Owners Group (non-owners are welcome as well), just do a search on "Minnesota winter" and you'll see her posts.