KC = No cloud/Sky clear
CLR = No clouds below 12,000 ft (3,700 m) (U.S.) or 25,000 ft (7,600 m) (Canada)
NSC = No (nil) significant cloud
FEW = "Few" = 1 to 2 oktas
SCT = "Scattered" = 3 to 4 oktas
BKN = "Broken" = 5 to 7 oktas
OVC = "Overcast" = 8 oktas, i.e., full cloud coverage
VV = Clouds cannot be seen because of fog or heavy precipitation, so vertical visibility is given instead.
CAVOK = Ceiling And Visibility OKay.
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