The column labels are as follows:

ID   TIME   T  TD  RH DIR SPD GST ALT SLP VIS CIL  COV WX  MAX MIN  PR6 PR24 SC

where

	ID is the ICAO station identifier column

	TIME is the UTC time of the observation

	
T is the temperature in degrees Celsius

	
TD is the dewpoint temperature in degrees Celsius

	
RH is the relative humidity in %

	
DIR is the wind direction in degrees (referenced from true north)
		 90 would be a wind blowing from the east
		180 would be a wind blowing from the south
		270 would be a wind blowing from the west
		360 would be a wind blowing from the north
		and so on ...

	
SPD is the wind speed in knots

	
GST is the gust speed (if reported) in knots

	
ALT is the abbreviated altimeter setting in inches of Hg
		if the first digit listed is 8 or 9, a leading 2 is missing
		if the first digit listed is 0 or 2, a leading 3 is missing
		Examples: 989 represents 29.89 in. Hg
			  032 represents 30.32 in. Hg

	
SLP is the abbreviated sea-level pressure in millibars (mb)
		if the first digit is 5 or greater, a leading 9 is missing
		if the first digit is less than 5, a leading 10 is missing
		Examples: 862 represents 986.2 mb
			  125 represents 1012.5 mb

	
VIS is the visibility in statute miles

	
CIL is the height of the lowest cloud base reported in hundreds of feet
		Examples: 8 represents 800 feet
			  35 represents 3,500 feet
			  210 represents 21,000 feet

	
COV is the cloud coverage
		X = obscured sky because of fog
		CLR or SKC = sky clear of clouds
		FEW = few clouds, but less than 2/8 cloud cover
		SCT = scattered cloud cover, 2/8 to 4/8 cloud cover
		BKN = broken cloud cover, 5/8 to 7/8 cloud cover
		OVC = overcast, 8/8 cloud cover

	
WX is the current weather
		Some of the most commonly reported weather conditions are:
			HZ = haze
			FG = fog
			DZ = drizzle
			RA = rain
			SN = snow
			TS = thunderstorm
			IP = ice pellets
                        BR = mist
			VC = in the vicinity (accompanied by another symbol)
		If any of the above is followed by a "-", it means light intensity
		If any of the above is followed by a "+", it means heavy intensity
		If neither a "-" or "+", it means moderate intensity

	
MAX is the maximum temperature (if reported)
		Maximum temperatures for the previous 24-hours are usually reported at 0000 UTC
		Other maximum temperatures would be over shorter intervals

	
MIN is the minimum temperature (if reported)
		Minimum temperatures for the previous 24-hours are usually reported at 1200 UTC
	 	Other minimum temperatures would be over shorter intervals

	
PR6 is the precipitation or liquid equivalent amount in inchesover the previous 6-hours

	
PR24 is the precipitation or liquid equivalent amount in inchesover the previous 24-hours

	
SC is the snow cover on the ground in inches (if reported) and usually reported at 1200 UTC