With the mercury dropping, there are three parts of your car that need attention to keep you safe during day-to-day and long-distance winter travels.
1 Tires, tires, tires.
Or should that be four? Tires are responsible for getting you up that snow-covered hill, slowing down when traffic is ahead of you and maneuvering where you need to. All-Wheel Drive (AWD) is great for helping with acceleration, but not much use when braking. There really is no substitution for the soft tire compound with extra siping (those small grooves in the tread) found on winter tires. Even winter tires aren't much use if there is no tread left though, so it's important to replace your snow tires if needed.
A good battery is one of the most important items to have to ensure your car will start when you need it to. Get it checked by a service technician at any dealer, chain repair store or small garage. Most quick lube stores will even check your battery as part of their lube, oil and filter service package.
Pay attention especially to your fuel and coolant. They should all be topped up and of the correct concentration (if applicable). Keep your fuel level high to reduce the chance of water collecting and freezing. That will also give you extra run time with the heater on if you happen to get stuck in the snow and are waiting for a tow truck.