0/8 Clear sky - dusk/dawnNo cloud at sky, sight might only be reduced by slight haze, the sky above is continuous visible.
0/8 Clear sky - nightNo cloud at sky, sight might only be reduced by slight haze, the moon and the sky above is continuous visible.
1/8 Sunny - day Sun continuous visible, only small breaks or a few clouds may haze the sky now and then.
1/8 Sunny - dusk/dawnSky continuous visible, only small breaks or a few clouds may haze the sky now and then.
1/8 Nearly clear - nightMoon continuous visible, only small breaks or a few clouds may haze the sky now and then.
2/8 Fair - day 2/8 Fair - dusk/dawn 2/8 Fair - night
3/8 Mostly sunny - day 
4/8 Partly cloudy - day 4/8 Partly cloudy - dusk/dawn 4/8 Partly cloudy - night
5/8 Mostly cloudy - day 5/8 Mostly cloudy - dusk/dawn 5/8 Mostly cloudy - night
6/8 Heavily cloudy - day 6/8 Heavily cloudy - dusk/dawn 6/8 Heavily cloudy - night
7/8 Broken - day 7/8 Broken - dusk/dawn 7/8 Broken - night
8/8 Cloudy / overcast - day The Sun is invisible, only slight light visible through clouds. Overcast due to high fog possible, as well as due to low stratus, without any spaces.
8/8 Cloudy / overcast - dusk/dawnThe sky is invisible, only slight light visible through clouds. Overcast due to high fog possible, as well as due to low stratus, without any spaces.
8/8 Cloudy / overcast - nightThe moon is invisible, only slight light visible through clouds. Overcast due to high fog possible, as well as due to low stratus, without any spaces.
9/8 Sky obscured by fog or other meteorological phenomena - day Cloudage impossible to be measured, sun and sky not visible, for example due to sand storms.
9/8 Sky obscured by fog or other meteorological phenomena - dusk/dawnCloudage impossible to be measured, sky not visible, for example due to sand storms.
9/8 Sky obscured by fog or other meteorological phenomena - nightCloudage impossible to be measured, moon not visible, for example due to sand storms.