What type of fog results from the cooling of air at night?

The type of fog that results from the cooling of air at night is radiation fog. This phenomenon occurs when the ground loses heat rapidly during the night, causing the air directly above it to cool. As this layer of air cools, it can reach its dew point, leading to the condensation of water vapor and forming fog. Radiation fog is typically most prevalent in clear, calm nights when there is little wind, allowing for effective radiative cooling.

Understanding radiation fog is important for pilots and other aviation professionals, as it can significantly reduce visibility and create hazardous conditions for flight operations.