What Causes Fogging on the Outside of the Windshield in Rainy Weather?

1 Answers
DelJustin
07/30/25 1:37am
Fogging on the outside of the front windshield during rainy days is caused by the temperature difference between the inside and outside of the vehicle. 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. Causes of fogging inside the car: The main reason for fogging inside the car is the temperature issue. When the temperature inside the car is higher than outside, the windows are prone to fogging. Additionally, high humidity inside the car and the warm breath exhaled by passengers can cause condensation when it meets the cold glass, leading to fogging. 2. Best solutions: The quickest and most effective method is to turn on the air conditioning's cold air. By activating the air conditioning's 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.
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