Name	Notation	Description	Types	Status
Cloud covering 1/2 or less of the sky throughout the appropriate period	0		Concept	stable
Cloud covering more than 1/2 of the sky during part of the appropriate period and covering 1/2 or less during part of the period	1		Concept	stable
Cloud covering more than 1/2 of the sky throughout the appropriate period	2		Concept	stable
Sandstorm, duststorm or blowing snow	3		Concept	stable
Fog or ice fog or thick haze	4		Concept	stable
Drizzle	5		Concept	stable
Rain	6		Concept	stable
Snow, or rain and snow mixed	7		Concept	stable
Shower(s)	8		Concept	stable
Thunderstorm(s) with or without precipitation	9		Concept	stable
No significant weather observed	10		Concept	stable
VISIBILITY REDUCED (see Note)	11		Concept	stable
Blowing phenomena, visibility reduced	12		Concept	stable
FOG (see Note)	13		Concept	stable
PRECIPITATION (see Note)	14		Concept	stable
Drizzle	15		Concept	stable
Rain	16		Concept	stable
Snow or ice pellets	17		Concept	stable
Showers or intermittent precipitation	18		Concept	stable
Thunderstorm	19		Concept	stable
Missing value	31		Concept	stable