The five core elements are:
PRCP = Precipitation (mm)
SNOW = Snowfall (mm)
SNWD = Snow depth (mm)
TMAX = Maximum temperature (degrees C)
TMIN = Minimum temperature (degrees C)

The other elements are:
ACMC = Average cloudiness midnight to midnight from 30-second ceilometer data (percent)
ACMH = Average cloudiness midnight to midnight from manual observations (percent)
ACSC = Average cloudiness sunrise to sunset from 30-second ceilometer data (percent)
ACSH = Average cloudiness sunrise to sunset from manual observations (percent)
ADPT = Average Dew Point Temperature for the day (degrees C)
ASLP = Average Sea Level Pressure for the day (hPa)
ASTP = Average Station Level Pressure for the day (hPa)
AWBT = Average Wet Bulb Temperature for the day (degrees C)
AWDR = Average daily wind direction (degrees)
AWND = Average daily wind speed (meters per second)
DAEV = Number of days included in the multiday evaporation total (MDEV)
DAPR = Number of days included in the multiday precipiation total (MDPR)
DASF = Number of days included in the multiday snowfall total (MDSF)
DATN = Number of days included in the multiday minimum temperature (MDTN)
DATX = Number of days included in the multiday maximum temperature (MDTX)
DAWM = Number of days included in the multiday wind movement (MDWM)
DWPR = Number of days with non-zero precipitation included in multiday precipitation total (MDPR)
EVAP = Evaporation of water from evaporation pan (mm)
FMTM = Time of fastest mile or fastest 1-minute wind (minutes)
FRGB = Base of frozen ground layer (cm)
FRGT = Top of frozen ground layer (cm)
FRTH = Thickness of frozen ground layer (cm)
GAHT = Difference between river and gauge height (cm)
MDEV = Multiday evaporation total (mm; use with DAEV)
MDPR = Multiday precipitation total (mm; use with DAPR and DWPR, if available)
MDSF = Multiday snowfall total
MDTN = Multiday minimum temperature (degrees C; use with DATN)
MDTX = Multiday maximum temperature (tenths of degress C; use with DATX)
MDWM = Multiday wind movement (km)
MNPN = Daily minimum temperature of water in an evaporation pan (degrees C)
MXPN = Daily maximum temperature of water in an evaporation pan (degrees C)
PGTM = Peak gust time (minutes)
PSUN = Daily percent of possible sunshine (percent)
RHAV = Average relative humidity for the day (percent)
RHMN = Minimum relative humidity for the day (percent)
RHMX = Maximum relative humidity for the day (percent)
SN*# = Minimum soil temperature (degrees C)
	where '*' corresponds to a code for ground cover and '#' corresponds to a code for soil depth.

	Ground cover codes include the following:
		0 = unknown
		1 = grass
		2 = fallow
		3 = bare ground
		4 = brome grass
		5 = sod
		6 = straw multch
		7 = grass muck
		8 = bare muck

	Depth codes include the following:
		1 = 5 cm
		2 = 10 cm
		3 = 20 cm
		4 = 50 cm
		5 = 100 cm
		6 = 150 cm
		7 = 180 cm

SX*# = Maximum soil temperature (degrees C) where '*' corresponds to a code for ground cover and '#' corresponds to a code for soil depth.
See SN*# for ground cover and depth codes.
TAXN = Average daily temperature computed as (TMAX+TMIN)/2.0 (degrees C)
TAVG = Average daily temperature (degrees C)
	[Note that TAVG from source 'S' corresponds to an average of hourly readings for the period ending at 2400 UTC rather than local midnight or other Local Standard Time according to a specific Met Service's protocol]
	[For sources other than 'S' TAVG is computed in a variety of ways including traditional fixed hours of the day whereas TAXN is solely computed as (TMAX+TMIN)/2.0]
THIC = Thickness of ice on water (mm)
TOBS = Temperature at the time of observation (degrees C)
TSUN = Daily total sunshine (minutes)
WDF1 = Direction of fastest 1-minute wind (degrees)
WDF2 = Direction of fastest 2-minute wind (degrees)
WDF5 = Direction of fastest 5-second wind (degrees)
WDFG = Direction of peak wind gust (degrees)
WDFI = Direction of highest instantaneous wind (degrees)
WDFM = Fastest mile wind direction (degrees)
WDMV = 24-hour wind movement (km)
WESD = Water equivalent of snow on the ground (mm)
WESF = Water equivalent of snowfall (mm)
WSF1 = Fastest 1-minute wind speed (meters per second)
WSF2 = Fastest 2-minute wind speed (meters per second)
WSF5 = Fastest 5-second wind speed (meters per second)
WSFG = Peak gust wind speed (meters per second)
WSFI = Highest instantaneous wind speed (meters per second)
WSFM = Fastest mile wind speed (meters per second)
WT** = Weather Type where ** has one of the following values:
		01 = Fog, ice fog, or freezing fog (may include heavy fog)
		02 = Heavy fog or heaving freezing fog (not always distinquished from fog)
		03 = Thunder
		04 = Ice pellets, sleet, snow pellets, or small hail
		05 = Hail (may include small hail)
		06 = Glaze or rime
		07 = Dust, volcanic ash, blowing dust, blowing sand, or blowing obstruction
		08 = Smoke or haze
		09 = Blowing or drifting snow
		10 = Tornado, waterspout, or funnel cloud
		11 = High or damaging winds
		12 = Blowing spray
		13 = Mist
		14 = Drizzle
		15 = Freezing drizzle
		16 = Rain (may include freezing rain, drizzle, and freezing drizzle)
		17 = Freezing rain
		18 = Snow, snow pellets, snow grains, or ice crystals
		19 = Unknown source of precipitation
		21 = Ground fog
		22 = Ice fog or freezing fog

WV** = Weather in the Vicinity where ** has one of the following values:
	01 = Fog, ice fog, or freezing fog (may include heavy fog)
	03 = Thunder
	07 = Ash, dust, sand, or other blowing obstruction
	18 = Snow or ice crystals
	20 = Rain or snow shower
