KMWH — Grant County International Airport
fog forecast & climatology · full 10-year analysis →
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When this airport fogs in
In a typical year Grant County International Airport spends 101 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in January and December. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.
Runway infrastructure
| end | approach lights | best approach | length | RVR |
|---|---|---|---|---|
| 04 | — | LPV | 10,000 ft | — |
| 22 | — | LPV | 10,000 ft | — |
| 09 | — | — | 3,500 ft | — |
| 27 | — | — | 3,500 ft | — |
| 14L | — | LPV | 13,503 ft | — |
| 32R | MALSR | CAT I | 13,503 ft | — |
| 14R | — | — | 2,936 ft | — |
| 32L | — | — | 2,936 ft | — |
| 18 | — | — | 3,327 ft | — |
| 36 | — | — | 3,327 ft | — |
From FAA NASR / curated AIP Canada research. Approach-light class and minima tier drive how low an approach can be flown — details in the chase board.
For flight operations
EFVS crews: the CHASE board ranks airports by live fog status, approach lighting, go-around height and flight time from your base. Forecast probabilities publish here per-airport once the calibrated model beats climatology on live verification — until then this page shows NWS guidance wording and measured climatology only. Methodology & verification.
Sources: NOAA/NWS National Blend of Models guidance · 10 years of METAR observations (Iowa Environmental Mesonet) · FAA NASR. Not for operational use.