What Is Cloud Ceiling? Definition & Meaning in Aviation
The cloud ceiling is the height of the lowest layer of cloud that covers more than half the sky (broken or overcast).
In plain language
A low ceiling can prevent landings, because pilots must see the runway before reaching a minimum height. It is reported in a METAR.
Example
For example, “BKN002” in a METAR means a broken cloud layer at 200 feet, which is a very low ceiling.
Why it matters
A low cloud ceiling can stop landings even when visibility is fine, because pilots must see the runway by a minimum height. It is a key number in the METAR.