What does a cloud cover of 7/8 indicate about visibility?

A cloud cover of 7/8 indicates that approximately seven-eighths of the sky is obscured by clouds. This substantial cover implies that there will be limited visibility due to the obstructive nature of the clouds. When visibility is assessed with such cloud coverage, it often correlates with adverse weather conditions, as lower visibility can result from factors such as precipitation or heavy cloudiness. Therefore, the high percentage of the sky covered by clouds aligns with conditions known for leading to lower visibility, particularly for pilots operating under visual flight rules.