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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

22/8Symbol for cloudage 2/8, fairfairno imageWeather graphics for daytime, for cloudage 2/8, fairWeather graphics for dawn time, for cloudage 2/8, fairWeather graphics for night time, for cloudage 2/8, fair-
33/8Symbol for cloudage 3/8, mostly sunnymostly sunnyImage viewWeather graphics for daytime, for cloudage 3/8, mostly sunnyWeather graphics for dawn time, for cloudage 3/8, mostly sunnyWeather graphics for night time, for cloudage 3/8, mostly sunny-
44/8Symbol for cloudage 4/8, partly cloudypartly cloudyno imageWeather graphics for daytime, for cloudage 4/8, partly cloudyWeather graphics for dawn time, for cloudage 4/8, partly cloudyWeather graphics for night time, for cloudage 4/8, partly cloudy-
55/8Symbol for cloudage 5/8, mostly cloudymostly cloudyno imageWeather graphics for daytime, for cloudage 5/8, mostly cloudyWeather graphics for dawn time, for cloudage 5/8, mostly cloudyWeather graphics for night time, for cloudage 5/8, mostly cloudy-
66/8Symbol for cloudage 6/8, heavily cloudyheavily cloudyno imageWeather graphics for daytime, for cloudage 6/8, heavily cloudyWeather graphics for dawn time, for cloudage 6/8, heavily cloudyWeather graphics for night time, for cloudage 6/8, heavily cloudy-
77/8Symbol for cloudage 7/8, brokenbrokenno imageWeather graphics for daytime, for cloudage 7/8, brokenWeather graphics for dawn time, for cloudage 7/8, brokenWeather graphics for night time, for cloudage 7/8, broken-
88/8Symbol for cloudage 8/8, cloudy / overcastcloudy / overcastno imageWeather graphics for daytime, for cloudage 8/8, cloudy / overcastWeather graphics for dawn time, for cloudage 8/8, cloudy / overcastWeather graphics for night time, for cloudage 8/8, cloudy / overcastSun, 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.
99/8Symbol for not recognisable cloudage 9/8Sky obscured by fog or other meteorological phenomena----Cloudage impossible to be measured, for example due to sand storms.