Ice fog typically occurs under what temperature condition?

Ice fog typically occurs when temperatures are below freezing, generally in conditions where the air is saturated with moisture. This phenomenon arises when the temperature is so low that water vapor in the air condenses directly into tiny ice crystals rather than forming liquid droplets, which creates the characteristic fog.

Under these conditions, the air's capacity to hold moisture decreases, leading to the formation of ice particles suspended in the air. Ice fog is most commonly observed in very cold climates, where the combination of low temperatures and high humidity results in the formation of these ice crystals.

The other temperature conditions described, such as being above freezing, at dew point, or above 0 degrees Celsius, do not support the formation of ice fog, as those scenarios would lead to the formation of liquid fog instead of ice.