- Radiation Fog: Occurs when the ground loses heat through radiation, typically at night. The fog condenses in the cool air at the Dew Point.
- Advection Fog: When warm, moist air moves horizontally over a cold surface, such as snow-covered ground or a cold ocean. For example, when the air moves from over the sea to over the land.
- Upslope Fog: Also known as Mountain Fog, this type of fog is created when vertically moving, humid air cools while climbing a topographic slope, such as a mountain.
- Evaporation Fog: Occurs when water vapor is added to cold air that is already near saturation.