At what temperature can carburetor icing begin to occur?

Carburetor icing can begin to occur at temperatures of 70 degrees Fahrenheit and below. This phenomenon is primarily due to the combination of temperature and humidity; when the air is humid, even though the temperature may be above freezing, the conditions can lead to the formation of ice within the carburetor. As the fuel vaporizes and expands, it causes a cooling effect, which can lower the temperature further and potentially lead to icing. Therefore, while many might assume that icing occurs only in freezing conditions, it is essential to recognize that temperatures above freezing but below 70 degrees can still create the right environment for carburetor icing, especially in high humidity conditions.