Which conditions favor the formation of fog by radiation cooling?

Fog by radiation cooling typically forms under clear skies, calm winds, and high humidity conditions, particularly during the night or early morning. When the ground loses heat rapidly through radiation, it cools the air close to the surface, causing water vapor to condense into tiny droplets. This process is most effective when the air is saturated or nearly saturated with moisture. Additionally, temperature inversions can further enhance fog formation by trapping the cool, moist air near the ground.