Flight Categories
METARs can be expressed concisely using so-called aviation flight categories, which indicates what classes of flight can operate at each airport by referring to the visibility and ceiling in each METAR. Four categories are used:
| Category | Visibility | Ceiling |
|---|---|---|
| VFR | > 5 mi | > 3,000 ft |
| Marginal VFR | Between 3 and 5 mi | Between 1,000 and 3,000 ft |
| IFR | 1 mi or more but less than 3 mi | 500 ft or more but less than 1,000 ft |
| Low IFR | < 1 mi | < 500 ft |
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