WMO Ice Concentration
Colour Code Standard

Color	Total Ice concentration
	Ice free
	< 1 tenth
	1 - 3 tenth
	4 - 6 tenth
	7 - 8 tenth
	9 - 10 tenth
	Fast Ice
	Shelf Ice
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?	Undefined Ice
	7/10 - 10/10 new ice
	9/10 - 10/10 nilas, grey ice mainly on leads

WMO Stage of Development
Colour Code Standard

Color	Stage of development -SoD	Ice Thickness
	Ice free
	< 1/10 ice of unspecified SoD
	New Ice	< 1 tenth cm
	Grey Ice	10-15 cm
	Grey-White Ice	15-30 cm
	First Year Ice (FY)	>= 30 cm
	First Year Thin Ice	30 - 70 cm
	First Year Medium Ice	70 - 120 cm
	First Thick Ice	> 120 cm
	Old Ice
	Second Year Ice
	Multi Year Ice	70 - 120 cm
	Fast Ice	> 120 cm
	Shelf Ice
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?	Undefined Ice
	Drifting Ice of land origin (icebergs)