On the coast, the thermal mass of the ocean moderates the extremes of winter and summer. But yeah, it will get cool. For safety, keep a couple of cheap blankets in the car trunk. They'll also protect your knees when you go to change tires.
Buy good wiper blades. The AANCO junk that gas stations have sold for years is just that--junk. Car makers have been going to beam blades, and for replacements you can try Bosch. They cost, but they'll last a couple of years and they keep working.
Modern car engines heat up fast to meet emission-control cold-start mandates. In all but subzero weather you'll have useful heating in a mile or so. Unfortunately, the Pinhead branch of the Federal Government has mandated that you can't have recirc and defrost at the same time, which means that when there is heavy wet snow falling just under freezing, you have to keep you windshield clear by taking cold outside air, cooling it further with the air conditioner (which will be on when you have the defroster on) and hoping your engine and heater core are big enough to get the defrost air warm enough. Unless your driving a Caddy or a Bentley, they won't be big enough. (And forget about it with a battery car.)