What, precisely, does partly cloudy mean? Forecasters use these descriptions of sky condition based upon tenths of the sky covered by opaque (not transparent) clouds.
|Cloudy||8/8 Opaque Clouds|
|Mostly Cloudy, or Considerable Cloudiness||6/8 to 7/8|
|Partly Cloudy, or Partly Sunny||3/8 to 5/8|
|Mostly Clear, or Mostly Sunny||1/8 to 2/8|
|Clear, or Sunny||0/8 Opaque Clouds|