What unit is used to report the height of clouds in METARs?

The height of clouds in METAR reports is typically expressed in feet above ground level (AGL). This measurement is standard in aviation meteorology because it provides a clear understanding of the cloud base relative to the ground. For pilots and air traffic controllers, knowing the altitude of cloud cover in feet AGL helps assess visibility, cloud formations, and potential hazards during flight operations.

While there are other units of measurement for atmospheric data, such as Meters MSL (mean sea level), kilometers AGL, and Feet MSL, AGL is specifically used for clouds to give a more practical indication of their height concerning where an aircraft is flying. This helps aviators make informed decisions regarding flight safety, navigation, and adherence to regulations concerning minimum visibility and cloud clearance requirements. Thus, the choice of feet AGL for reporting cloud heights is essential for effective communication and operational clarity in aviation.