If you switch to 19" wheels there are winter tire options available, also more all-season tire options. You would also need to purchase a set of tire pressure monitor system (TPMS) sensors for $300 to $400 / per set of 4 sensors.
Performance Model Y owners will soon be able to purchase the Michelin Pilot Sport AS4 ultra high performance all-season tire in size 255/35R-21 (Front) and 275/35R-21 (Rear.) For those who can't wait the Pilot Sport AS4 tire in 265/35R-21 can be substituted for the front tire although it may slightly rub the fender liner at the turn limit of the steering wheel.