If you get stranded in your car in a remote area, the key to survival is having some tools that you can use to survive, and having the knowledge to know what you need to do to survive. Depending on how cold it is outside, you should run your car a little as possible to save fuel, especially during daylight hours.

It is surprising how warm it will stay in your car when the sun is shining, even if it's very cold outside. If a snowstorm has stranded you it is likely that it will be sunny when the storm has passed. It will also likely be colder. Clear sky's are associated with high pressure systems that normally move in after a storm. What comes with high pressure in the winter is also colder temps.

One thing not on the list that you should always have with you if there is any chance of getting stranded is a survival book that can walk you through how to gather or create shelter, water, food, etc, that you will need to survive. You should read through it every year just to familiarize yourself with techniques, then go out and try some of the things that you may need to survive. Learn to start a fire by doing it. If you have a car you have shelter, if you can build a fire, you're odds of surviving go up dramatically.

Water is one of the most important things you must have to survive, melting snow with a fire gives you a huge supply of water in the winter. Practice the techniques that are in your book so if you need them, you will have an idea at least of what you need to do.