The recent drop in temperatures could cause your car windshield to crack. Glass expands and contracts due to temperature so it is important to avoid sudden temperature changes. Never use boiling water to defrost your windshield. Instead, turn on the defroster and let the windshield warm up slowly. However, be careful not to set the defroster too high. Let the windshield warm up gradually so the glass isn't shocked by cold temperatures outside and warm temperatures inside, which can also lead to cracking. According to glassamerica.net, "No matter how durable a windshield is, it is still glass.