I live in Ithaca, NY, but as a Michigan ex-pat I can tell you that NY and Michigan winters aren’t usually too different. My friend who’s a Tesla owner (also Model S) drives it all year, and it does fine in Ithaca winters. The handling is actually pretty good, with winter tires. The one big discovery he had was that snow is a range-killer, because it tends to get stuck in the wheel-wells and cause additional friction. So if you’re doing a lot of long-distance winter Tesla driving, make sure that you keep your wheels clean and get regular car washes to avoid salt build-up on the undercarriage.