Table 3. Total Cloud Amount.

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   Radio                                                              Code on
transmission                                                        observation
code figures    Proportion of sky covered (in tenths)                  form
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     0          0                                                      0   
     1          Less than 0.1                                          * 
     2          0.1                                                    1
     3          0.2 to 0.3                                             2,3
     4          0.4 to 0.6                                             4,5,6
     5          0.7 to 0.8                                             7,8
     6          0.9                                                    9
     7          More than 0.9 but with openings                        *  
     8          Sky completely covered with clouds                     10
     9          Sky obscured by fog, dust storm, or other phenomenon   *
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* No corresponding code.
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