- SKC = 没有云/晴空
- CLR = 没有云低于12000英尺（3700米）（美国）或25000英尺（7600米）（加拿大）
- NSC = 没有（无）明显的云
- FEW = "少云" = 1 to 2 oktas
- SCT = "Scattered" = 3 to 4 oktas
- BKN = "Broken" = 5 to 7 oktas
- OVC = "多云" = 8 oktas, i.e., full cloud coverage
- VV = 由于大雾或强降水，所以不能看到云，因此可以给出垂直能见度.
- CAVOK = Ceiling And Visibility OKay.
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