What does "CIG" refer to in aviation weather terminology?

In aviation weather terminology, "CIG" is an abbreviation for Ceiling, which specifically refers to the height of the lowest layer of clouds above the ground. It is an important metric for pilots as it directly affects visual flight rules (VFR) and instrument flight rules (IFR) operations. The ceiling helps determine how much of the sky is covered by clouds and at what altitude, and it plays a critical role in safety by informing pilots about potential visibility issues as they navigate and land.

Understanding ceiling is vital for flight operations because low ceilings can restrict pilots’ ability to fly visually, requiring them to rely on instruments instead. This critical information is provided in weather reports and forecasts, ensuring pilots have the necessary data to make informed decisions about flight routes and safety.