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To understand why cold weather can lead to windshield cracks, we need to delve into the physics of materials. Glass, despite its appearance of solidity, is actually a fragile material that expands and contracts with changes in temperature. When temperatures drop, glass contracts. If there are existing flaws or weaknesses in the windshield, such as small chips or imperfections, the stress caused by contraction can exacerbate these flaws, leading to cracks.