| The following codes are used to denote stages of development for sea ice. | The following codes are used to denote stages of development for fresh water ice: | ||
| Stage of Development | Code Figure | Stage of Development | Code Figure |
| New Ice-Frazil, Grease, Slush, Shuga (0-10 cm) | 1 | New Ice (0 cm - 5 cm) | 1 |
| Nilas, Ice Rind (0 - 10 cm) | 2 | Thin Ice (5 cm - 15 cm) | 4 |
| Young (10 - 30 cm) | 3 | Medium Ice (15 cm - 30 cm) | 5 |
| Gray (10 - 15 cm) | 4 | Thick Ice (30 cm - 70 cm) | 7 |
| Gray - White (15 - 30 cm) | 5 | First Stage Thick Ice (30 cm - 50 cm) | 8 |
| First Year (30 - 200 cm) | 6 | Second Stage Thick Ice (50 cm - 70 cm) | 9 |
| First Year Thin (30 - 70 cm) | 7 | Very Thick Ice (70 cm - 120 cm) | 1. |
| First Year Thin- First Stage (30 - 70 cm) | 8 | ||
| First Year Thin- Second Stage (30 - 70 cm) | 9 | ||
| Med First Year (70 - 120 cm) | 1. | ||
| Thick First Year (>120 cm) | 4. | ||
| Old-Survived at least one seasons melt (>2 m) | 7. | ||
| Second Year (>2 m) | 8. | ||
| Multi-Year (>2 m) | 9. | ||
| Ice of Land Origin |  |
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