Name	Notation	Description	Types	Status
Cloud development not observed or not observable	0		Concept	stable
Clouds generally dissolving or becoming less developed	1		Concept	stable
State of sky on the whole unchanged	2		Concept	stable
Clouds generally forming or developing	3		Concept	stable
Visibility reduced by smoke, e.g. veldt or forest fires, industrial smoke or volcanic ashes	4		Concept	stable
Haze	5		Concept	stable
Widespread dust in suspension in the air, not raised by wind at or near the station at the time of observation	6		Concept	stable
Dust or sand raised by wind at or near the station at the time of observation, but no well-developed dust whirl(s) or sand whirl(s), and no duststorm or sandstorm seen; or, in the case of sea stations and coastal stations, blowing spray at the station	7		Concept	stable
Well-developed dust whirl(s) or sand whirl(s) seen at or near the station during the preceding hour or at the same time of observation, but no duststorm or sandstorm	8		Concept	stable
Duststorm or sandstorm within sight at the time of observation, or at the station during the preceding hour	9		Concept	stable
Mist	10		Concept	stable
Patches	11		Concept	stable
More or less continuous	12		Concept	stable
Lightning visible, no thunder heard	13		Concept	stable
Precipitation within sight, not reaching the ground or the surface of the sea	14		Concept	stable
Precipitation within sight, reaching the ground or the surface of the sea, but distant, i.e. estimated to be more than 5 km from the station	15		Concept	stable
Precipitation within sight, reaching the ground or the surface of the sea, near to, but not at the station	16		Concept	stable
Thunderstorm, but no precipitation at the time of observation	17		Concept	stable
Squalls	18		Concept	stable
Funnel cloud(s)	19		Concept	stable
Drizzle (not freezing) or snow grains	20		Concept	stable
Rain (not freezing)	21		Concept	stable
Snow	22		Concept	stable
Rain and snow or ice pellets	23		Concept	stable
Freezing drizzle or freezing rain	24		Concept	stable
Shower(s) of rain	25		Concept	stable
Shower(s) of snow, or of rain and snow	26		Concept	stable
Shower(s) of hail*, or of rain and hail*	27		Concept	stable
Fog or ice fog	28		Concept	stable
Thunderstorm (with or without precipitation)	29		Concept	stable
Slight or moderate duststorm or sandstorm	30		Concept	stable
Slight or moderate duststorm or sandstorm	31		Concept	stable
Slight or moderate duststorm or sandstorm	32		Concept	stable
Severe duststorm or sandstorm	33		Concept	stable
Severe duststorm or sandstorm	34		Concept	stable
Severe duststorm or sandstorm	35		Concept	stable
Slight or moderate drifting snow	36		Concept	stable
Heavy drifting snow	37		Concept	stable
Slight or moderate blowing snow	38		Concept	stable
Heavy blowing snow	39		Concept	stable
Fog or ice fog at a distance at the time of observation, but not at the station during the preceding hour, the fog or ice fog extending to a level above that of the observer	40		Concept	stable
Fog or ice fog in patches	41		Concept	stable
Fog or ice fog, sky visible	42		Concept	stable
Fog or ice fog, sky invisible	43		Concept	stable
Fog or ice fog, sky visible	44		Concept	stable
Fog or ice fog, sky invisible	45		Concept	stable
Fog or ice fog, sky visible	46		Concept	stable
Fog or ice fog, sky invisible	47		Concept	stable
Fog, depositing rime, sky visible	48		Concept	stable
Fog, depositing rime, sky invisible	49		Concept	stable
Drizzle, not freezing, intermittent	50		Concept	stable
Drizzle, not freezing, continuous	51		Concept	stable
Drizzle, not freezing, intermittent	52		Concept	stable
Drizzle, not freezing, continuous	53		Concept	stable
Drizzle, not freezing, intermittent	54		Concept	stable
Drizzle, not freezing, continuous	55		Concept	stable
Drizzle, freezing, slight	56		Concept	stable
Drizzle, freezing, moderate or heavy (dense)	57		Concept	stable
Drizzle and rain, slight	58		Concept	stable
Drizzle and rain, moderate or heavy	59		Concept	stable
Rain, not freezing, intermittent	60		Concept	stable
Rain, not freezing, continuous	61		Concept	stable
Rain, not freezing, intermittent	62		Concept	stable
Rain, not freezing, continuous	63		Concept	stable
Rain, not freezing, intermittent	64		Concept	stable
Rain, not freezing, continuous	65		Concept	stable
Rain, freezing, slight	66		Concept	stable
Rain, freezing, moderate or heavy	67		Concept	stable
Rain or drizzle and snow, slight	68		Concept	stable
Rain or drizzle and snow, moderate or heavy	69		Concept	stable
Intermittent fall of snowflakes	70		Concept	stable
Continuous fall of snowflakes	71		Concept	stable
Intermittent fall of snowflakes	72		Concept	stable
Continuous fall of snowflakes	73		Concept	stable
Intermittent fall of snowflakes	74		Concept	stable
Continuous fall of snowflakes	75		Concept	stable
Diamond dust (with or without fog)	76		Concept	stable
Snow grains (with or without fog)	77		Concept	stable
Isolated star-like snow crystals (with or without fog)	78		Concept	stable
Ice pellets	79		Concept	stable
Rain shower(s), slight	80		Concept	stable
Rain shower(s), moderate or heavy	81		Concept	stable
Rain shower(s), violent	82		Concept	stable
Shower(s) of rain and snow mixed, slight	83		Concept	stable
Shower(s) of rain and snow mixed, moderate or heavy	84		Concept	stable
Snow shower(s), slight	85		Concept	stable
Snow shower(s), moderate or heavy	86		Concept	stable
Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed	87		Concept	stable
Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed	88		Concept	stable
Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder	89		Concept	stable
Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder	90		Concept	stable
Slight rain at time of observation	91		Concept	stable
Moderate or heavy rain at time of observation	92		Concept	stable
Slight snow, or rain and snow mixed or hail* at time of observation	93		Concept	stable
Moderate or heavy snow, or rain and snow mixed or hail* at time of observation	94		Concept	stable
Thunderstorm, slight or moderate, without hail*, but with rain and/or snow at time of observation	95		Concept	stable
Thunderstorm, slight or moderate, with hail* at time of observation	96		Concept	stable
Thunderstorm, heavy, without hail*, but with rain and/or snow at time of observation	97		Concept	stable
Thunderstorm combined with duststorm or sandstorm at time of observation	98		Concept	stable
Thunderstorm, heavy, with hail* at time of observation	99		Concept	stable
No significant weather observed	100		Concept	stable
Clouds generally dissolving or becoming less developed during the past hour	101		Concept	stable
State of sky on the whole unchanged during the past hour	102		Concept	stable
Clouds generally forming or developing during the past hour	103		Concept	stable
Haze or smoke, or dust in suspension in the air, visibility equal to, or greater than, 1 km	104		Concept	stable
Haze or smoke, or dust in suspension in the air, visibility less than 1 km	105		Concept	stable
Mist	110		Concept	stable
Diamond dust	111		Concept	stable
Distant lightning	112		Concept	stable
Squalls	118		Concept	stable
Fog	120		Concept	stable
PRECIPITATION	121		Concept	stable
Drizzle (not freezing) or snow grains	122		Concept	stable
Rain (not freezing)	123		Concept	stable
Snow	124		Concept	stable
Freezing drizzle or freezing rain	125		Concept	stable
Thunderstorm (with or without precipitation)	126		Concept	stable
BLOWING OR DRIFTING SNOW OR SAND	127		Concept	stable
Blowing or drifting snow or sand, visibility equal to, or greater than, 1 km	128		Concept	stable
Blowing or drifting snow or sand, visibility less than 1 km	129		Concept	stable
FOG	130		Concept	stable
Fog or ice fog in patches	131		Concept	stable
Fog or ice fog, has become thinner during the past hour	132		Concept	stable
Fog or ice fog, no appreciable change during the past hour	133		Concept	stable
Fog or ice fog, has begun or become thicker during the past hour	134		Concept	stable
Fog, depositing rime	135		Concept	stable
PRECIPITATION	140		Concept	stable
Precipitation, slight or moderate	141		Concept	stable
Precipitation, heavy	142		Concept	stable
Liquid precipitation, slight or moderate	143		Concept	stable
Liquid precipitation, heavy	144		Concept	stable
Solid precipitation, slight or moderate	145		Concept	stable
Solid precipitation, heavy	146		Concept	stable
Freezing precipitation, slight or moderate	147		Concept	stable
Freezing precipitation, heavy	148		Concept	stable
DRIZZLE	150		Concept	stable
Drizzle, not freezing, slight	151		Concept	stable
Drizzle, not freezing, moderate	152		Concept	stable
Drizzle, not freezing, heavy	153		Concept	stable
Drizzle, freezing, slight	154		Concept	stable
Drizzle, freezing, moderate	155		Concept	stable
Drizzle, freezing, heavy	156		Concept	stable
Drizzle and rain, slight	157		Concept	stable
Drizzle and rain, moderate or heavy	158		Concept	stable
RAIN	160		Concept	stable
Rain, not freezing, slight	161		Concept	stable
Rain, not freezing, moderate	162		Concept	stable
Rain, not freezing, heavy	163		Concept	stable
Rain, freezing, slight	164		Concept	stable
Rain, freezing, moderate	165		Concept	stable
Rain, freezing, heavy	166		Concept	stable
Rain (or drizzle) and snow, slight	167		Concept	stable
Rain (or drizzle) and snow, moderate or heavy	168		Concept	stable
SNOW	170		Concept	stable
Snow, slight	171		Concept	stable
Snow, moderate	172		Concept	stable
Snow, heavy	173		Concept	stable
Ice pellets, slight	174		Concept	stable
Ice pellets, moderate	175		Concept	stable
Ice pellets, heavy	176		Concept	stable
Snow grains	177		Concept	stable
Ice crystals	178		Concept	stable
SHOWER(S) OR INTERMITTENT PRECIPITATION	180		Concept	stable
Rain shower(s) or intermittent rain, slight	181		Concept	stable
Rain shower(s) or intermittent rain, moderate	182		Concept	stable
Rain shower(s) or intermittent rain, heavy	183		Concept	stable
Rain shower(s) or intermittent rain, violent	184		Concept	stable
Snow shower(s) or intermittent snow, slight	185		Concept	stable
Snow shower(s) or intermittent snow, moderate	186		Concept	stable
Snow shower(s) or intermittent snow, heavy	187		Concept	stable
Hail	189		Concept	stable
THUNDERSTORM	190		Concept	stable
Thunderstorm, slight or moderate, with no precipitation	191		Concept	stable
Thunderstorm, slight or moderate, with rain showers and/or snow showers	192		Concept	stable
Thunderstorm, slight or moderate, with hail	193		Concept	stable
Thunderstorm, heavy, with no precipitation	194		Concept	stable
Thunderstorm, heavy, with rain showers and/or snow showers	195		Concept	stable
Thunderstorm, heavy, with hail	196		Concept	stable
Tornado	199		Concept	stable
Volcanic ash suspended in the air aloft	204		Concept	stable
Not used	205		Concept	stable
Thick dust haze, visibility less than 1 km	206		Concept	stable
Blowing spray at the station	207		Concept	stable
Drifting dust (sand)	208		Concept	stable
Wall of dust or sand in distance (like haboob)	209		Concept	stable
Snow haze	210		Concept	stable
Whiteout	211		Concept	stable
Not used	212		Concept	stable
Lightning, cloud to surface	213		Concept	stable
Dry thunderstorm	217		Concept	stable
Not used	218		Concept	stable
Tornado cloud (destructive) at or within sight of the station during preceding hour or at the time of observation	219		Concept	stable
Deposition of volcanic ash	220		Concept	stable
Deposition of dust or sand	221		Concept	stable
Deposition of dew	222		Concept	stable
Deposition of wet snow	223		Concept	stable
Deposition of soft rime	224		Concept	stable
Deposition of hard rime	225		Concept	stable
Deposition of hoar frost	226		Concept	stable
Deposition of glaze	227		Concept	stable
Deposition of ice crust (ice slick)	228		Concept	stable
Not used	229		Concept	stable
Duststorm or sandstorm with temperature below 0 °C	230		Concept	stable
Blowing snow, impossible to determine whether snow is falling or not	239		Concept	stable
Not used	240		Concept	stable
Fog on sea	241		Concept	stable
Fog in valleys	242		Concept	stable
Arctic or Antarctic sea smoke	243		Concept	stable
Steam fog (sea, lake or river)	244		Concept	stable
Steam log (land)	245		Concept	stable
Fog over ice or snow cover	246		Concept	stable
Dense fog, visibility 60-90 m	247		Concept	stable
Dense fog, visibility 30-60 m	248		Concept	stable
Dense fog, visibility less than 30 m	249		Concept	stable
Drizzle, rate of fall - less than 0.10 mm h-1	250		Concept	stable
Drizzle, rate of fall - 0.10-0.19 mm h-1	251		Concept	stable
Drizzle, rate of fall - 0.20-0.39 mm h-1	252		Concept	stable
Drizzle, rate of fall - 0.40-0.79 mm h-1	253		Concept	stable
Drizzle, rate of fall - 0.80-1.59 mm h-1	254		Concept	stable
Drizzle, rate of fall - 1.60-3.19 mm h-1	255		Concept	stable
Drizzle, rate of fall - 3.20-6.39 mm h-1	256		Concept	stable
Drizzle, rate of fall - 6.4 mm h-1 or more	257		Concept	stable
Not used	258		Concept	stable
Drizzle and snow	259		Concept	stable
Rain, rate of fall - less than 1.0 mm h-1	260		Concept	stable
Rain, rate of fall - 1.0-1.9 mm h-1	261		Concept	stable
Rain, rate of fall - 2.0-3.9 mm h-1	262		Concept	stable
Rain, rate of fall - 4.0-7.9 mm h-1	263		Concept	stable
Rain, rate of fall - 8.0-15.9 mm h-1	264		Concept	stable
Rain, rate of fall - 16.0-31.9 mm h-1	265		Concept	stable
Rain, rate of fall - 32.0-63.9 mm h-1	266		Concept	stable
Rain, rate of fall - 64.0 mm h-1 or more	267		Concept	stable
Snow, rate of fall - less than 1.0 cm h-1	270		Concept	stable
Snow, rate of fall - 1.0-1.9 cm h-1	271		Concept	stable
Snow, rate of fall - 2.0-3.9 cm h-1	272		Concept	stable
Snow, rate of fall - 4.0-7.9 cm h-1	273		Concept	stable
Snow, rate of fall - 8.0-15.9 cm h-1	274		Concept	stable
Snow, rate of fall - 16.0-31.9 cm h-1	275		Concept	stable
Snow, rate of fall - 32.0-63.9 cm h-1	276		Concept	stable
Snow, rate of fall - 64.0 cm h-1 or more	277		Concept	stable
Snow or ice crystal precipitation from a clear sky	278		Concept	stable
Wet snow, freezing on contact	279		Concept	stable
Precipitation of rain	280		Concept	stable
Precipitation of rain, freezing	281		Concept	stable
Precipitation of rain and snow mixed	282		Concept	stable
Precipitation of snow	283		Concept	stable
Precipitation of snow pellets or small hall	284		Concept	stable
Precipitation of snow pellets or small hail, with rain	285		Concept	stable
Precipitation of snow pellets or small hail, with rain and snow mixed	286		Concept	stable
Precipitation of snow pellets or small hail, with snow	287		Concept	stable
Precipitation of hail	288		Concept	stable
Precipitation of hail, with rain	289		Concept	stable
Precipitation of hall, with rain and snow mixed	290		Concept	stable
Precipitation of hail, with snow	291		Concept	stable
Shower(s) or thunderstorm over sea	292		Concept	stable
Shower(s) or thunderstorm over mountains	293		Concept	stable
No significant phenomenon to report, present and past weather omitted	508		Concept	stable
No observation, data not available, present and past weather omitted	509		Concept	stable
Present and past weather missing, but expected	510		Concept	stable
Missing value	511		Concept	stable