A sky cover of 5/8 is reported using which code?

The code used to report a sky cover of 5/8 is "BKN", which stands for "broken". In aviation weather reports, sky cover is quantified using fractions of the sky that are obscured by cloud cover. When the coverage is between 5/8 and 7/8 of the sky, it is classified as broken. This indicates that significant portions of the sky are covered by clouds, but there are still clear areas visible.

The other codes refer to different levels of cloud cover. "OVC" stands for overcast, which indicates that more than 7/8 of the sky is covered with clouds. "SCT" refers to scattered clouds, where 1/8 to 4/8 of the sky is clouded. "CLR" denotes a clear sky with little to no cloud cover, indicating that less than 1/8 of the sky has clouds. Thus, for a sky cover of 5/8, "BKN" is the correct and appropriate code to use.