Code table 2700 N - Total cloud cover Code figure 0 0 1 1 okta or less, but not zero 1/10 or less, but not zero 2 2 oktas 2/10 - 3/10 3 3 oktas 4/10 4 4 oktas 5/10 5 5 oktas 6/10 6 6 oktas 7/10 - 8/10 7 7 oktas or more, but not 8 oktas 9/10 or more, but not 10/10 8 8 oktas 10/10 9 Sky obscured by fog and/or other meteorological phenomena / Cloud cover is indiscernible for reasons other than fog or other meteorological phenomena, or observation is not made