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