Why does frost form on the windshield?

[ChristianLynn]

Frost forms on the windshield due to the following reasons: Residual heat after passengers leave the car at night: When passengers leave the car in the evening, residual heat remains inside the vehicle, causing the windshield temperature to be higher than the outside temperature. If the external temperature is too low or it snows, the snowflakes that land on the windshield will initially melt. Interior and exterior temperature differences: As the snowflakes melt, the interior temperature gradually drops to match the outside temperature. At this point, the melted snow on the windshield begins to freeze. Subsequently, any additional snowflakes that fall on the glass will no longer melt but instead accumulate like a blanket over the ice layer. The moisture inside the car then solidifies into ice beads, forming frost on the windshield. This is how frost develops.