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  1. Meteopool
  2. Weather encyclopedia
  3. Cloud cover and symbols according to WMO

Cloud cover and symbols according to WMO definitions (in oktas)

Symbol for cloudage 0/8, clear sky 0/8 Clear sky - day
No cloud at sky, sight might only be reduced by slight haze, the sun and the sky above is continuous visible.
Symbol for cloudage 0/8, clear sky 0/8 Clear sky - dusk/dawn
Symbol for cloudage 0/8, clear sky 0/8 Clear sky - night
No cloud at sky, sight might only be reduced by slight haze, the moon and the sky above is continuous visible.
Symbol for cloudage 1/8, sunny 1/8 Sunny - day
Sun continuous visible, only small breaks or a few clouds may haze the sky now and then.
Symbol for cloudage 1/8, sunny 1/8 Sunny - dusk/dawn
Symbol for cloudage 1/8, sunny 1/8 Nearly clear - night
Moon continuous visible, only small breaks or a few clouds may haze the sky now and then.

WMO-Definitions

Images and graphics

No

Eigth/Oktas

Icon

Description/Cloudage

Photo

Day

Dawn

Night

Commentary

2 2/8 Symbol for cloudage 2/8, fair fair no image Weather graphics for daytime, for cloudage 2/8, fair Weather graphics for dawn time, for cloudage 2/8, fair Weather graphics for night time, for cloudage 2/8, fair -
3 3/8 Symbol for cloudage 3/8, mostly sunny mostly sunny Image view Weather graphics for daytime, for cloudage 3/8, mostly sunny Weather graphics for dawn time, for cloudage 3/8, mostly sunny Weather graphics for night time, for cloudage 3/8, mostly sunny -
4 4/8 Symbol for cloudage 4/8, partly cloudy partly cloudy no image Weather graphics for daytime, for cloudage 4/8, partly cloudy Weather graphics for dawn time, for cloudage 4/8, partly cloudy Weather graphics for night time, for cloudage 4/8, partly cloudy -
5 5/8 Symbol for cloudage 5/8, mostly cloudy mostly cloudy no image Weather graphics for daytime, for cloudage 5/8, mostly cloudy Weather graphics for dawn time, for cloudage 5/8, mostly cloudy Weather graphics for night time, for cloudage 5/8, mostly cloudy -
6 6/8 Symbol for cloudage 6/8, heavily cloudy heavily cloudy no image Weather graphics for daytime, for cloudage 6/8, heavily cloudy Weather graphics for dawn time, for cloudage 6/8, heavily cloudy Weather graphics for night time, for cloudage 6/8, heavily cloudy -
7 7/8 Symbol for cloudage 7/8, broken broken no image Weather graphics for daytime, for cloudage 7/8, broken Weather graphics for dawn time, for cloudage 7/8, broken Weather graphics for night time, for cloudage 7/8, broken -
8 8/8 Symbol for cloudage 8/8, cloudy / overcast cloudy / overcast no image Weather graphics for daytime, for cloudage 8/8, cloudy / overcast Weather graphics for dawn time, for cloudage 8/8, cloudy / overcast Weather graphics for night time, for cloudage 8/8, cloudy / overcast Sun, moon and sky invisible, only slight light visible through clouds. Overcast due to high fog possible, as well as due to low stratus, without any spaces.
9 9/8 Symbol for not recognisable cloudage 9/8 Sky obscured by fog or other meteorological phenomena - - - - Cloudage impossible to be measured, for example due to sand storms.