| Bit | Description |
|---|---|
| 0 | Air temperature |
| 1 | Relative humidity |
| 2 | Dew point temperature |
| 3 | Frost point temperature |
| 4 | Surface temperature |
| 5 | Surface state according to Vaisala classification |
| 6 | Surface state according to the EN 15518 standard |
| 7 | Grip |
| 8 | Water layer thickness |
| 9 | Ice layer thickness |
| 10 | Snow layer thickness |
| 11–15 | Reserved for future use |