| Code Value | Definition |
|---|---|
| 0 | No Additional Atmospheric Conditions |
| 1 | Clear |
| 10 | Cloudy |
| 11 | Blowing Snow |
| 12 | Freezing Rain or Drizzle |
| 2 | Rain |
| 3 | Sleet or Hail |
| 4 | Snow |
| 5 | Fog, Smog, Smoke |
| 6 | Severe Crosswinds |
| 7 | Blowing Sand, Soil, Dirt |
| 8 | Other |
| 98 | Not Reported |
| 99 | Unknown |