Hailstorms are not uncommon in winter weather and one can strike when you are in your car. When that happens, it is very helpful to have a windshield that is strong enough to bear the force of hail. Fortunately, a lot of windshields and other auto glass is made using tempered glass which can only be broken with very heavy force. If your car is parked somewhere exposed and not in a garage, you can use a tarp, a sleeping bag or heavy blankets to protect the windscreen. Keeping up with the weather to know if there is an impending hailstorm is also helpful. There is an app for this.