During what temperature is icing typically expected to occur?

Icing is typically expected to occur at temperatures at or below freezing. This is primarily because when the atmospheric temperature is below 0 degrees Celsius (32 degrees Fahrenheit), any supercooled water droplets present in the cloud can freeze upon contact with an aircraft's surfaces. This phenomenon is most likely to happen during precipitation events, where liquid droplets exist in temperatures that are below freezing.

When conditions are at or below freezing, moisture in the air can lead to the formation of ice, resulting in hazardous icing conditions for aircraft. At temperatures above freezing, ice formation is less common as the temperatures are generally warm enough to prevent the supercooling of water droplets, thus reducing the risk of ice accumulation.

While icing can occur in specific conditions even in temperate zones and at certain temperatures, the fundamental understanding remains that the occurrence of icing is most likely when the temperatures are at or below freezing.