Why is there frost on the inside of my windshield and how can I prevent it from happening?

Frost forms on the inside of your windshield when warm, moist air inside the car comes into contact with the cold surface of the glass. To prevent this, you can try reducing the humidity inside your car by using a dehumidifier or cracking a window open slightly to allow the moist air to escape. You can also use a windshield cover or park your car in a garage to keep the temperature more consistent.