Which of the following best describes cloud cover reported as BKN in METAR?

Cloud cover reported as "BKN" in METAR indicates "broken" cloud cover. This term specifies that between 5/8 and 7/8 of the sky is covered by clouds. It provides essential information for pilots and meteorologists regarding the condition of the atmosphere, as broken clouds often influence visibility and weather conditions significantly.

In aviation contexts, understanding cloud cover is crucial for flight operations, as broken clouds might indicate areas where pilots need to manage their altitude and approach strategies effectively. The term is standardized in meteorology, making it a reliable descriptor for assessing cloudiness at a given reporting station.

The other terms differ in coverage: "scattered" refers to less than 5/8 coverage, "overcast" means the sky is fully covered (100%), and "clear sky" indicates no significant cloudiness. Each of these terms conveys specific and distinct information about the cloud conditions, highlighting the importance of clarity and precision in METAR reports.