What Causes Fogging on the Outside of the Windshield on Rainy Days?

[DeCole]

Fogging on the outside of the windshield on rainy days is caused by the temperature difference between the inside and outside of the car. The temperature inside the cabin is higher than outside, leading to condensation of moisture inside the cabin on the inner windshield, forming fog. Below is related information on defogging: 1. Reasons for fogging inside the car: The main reason for fogging inside the car is temperature. When the temperature inside the car is higher than outside, the windows are prone to fogging. Another reason is the high humidity inside the car, combined with the warm breath exhaled by passengers. When this warm air meets the cold glass, it condenses, leading to fogging on the windows. 2. Best solutions: The quickest and most effective method is to turn on the air conditioning's cold air. By activating the AC cooling function along with the external circulation, the fog on the glass should disappear in less than a minute. During autumn or winter, using the air conditioning's warm air to blow on the windshield is recommended.