How is 6/8ths sky cover reported in METAR?

In METAR reporting, sky cover is represented by terms that indicate the amount of the sky that is obscured by clouds. The correct choice regarding 6/8ths sky cover is indicated by the term "BKN," which stands for "broken." This term is used to denote that between 5/8ths and 7/8ths of the sky is covered with clouds. Since 6/8ths falls within this range, it accurately corresponds to the broken cloud condition.

The other terms have specific meanings: "CLR" indicates clear skies with no significant cloud cover, "OVC" is used when the sky is overcast, meaning 8/8ths cloud cover, and "SCT" signifies scattered clouds, typically representing less than 5/8ths cloud cover. Thus, they do not apply to the situation of 6/8ths sky cover.