ENAT — Alta Airport

fog forecast & climatology · Alta city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 1 hour of dense fog here (10-year average).

Fog hours per year
15 h below CAT I minima (2016–2026 average)
Fog season
March and February
Typical fog event
~1 h once it forms (middle half 1–1 h, n=140)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Alta Airport spends 15 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in March and February. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~2 hJanFebruary: ~2 hFebMarch: ~4 hMarApril: ~1 hAprMay: ~1 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~1 hAugSeptember: ~1 hSepOctober: ~0 hOctNovember: ~1 hNovDecember: ~1 hDec
Fog season runs January through March, peaking in March; fog is mostly a 2 AM–4 AM phenomenon; typically thinning out by 5 AM; a typical event lasts about 1 hour once it forms local time · 10-yr average

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 — receipts on the scorecard. Methodology.

Sources: NOAA/NWS National Blend of Models guidance · METAR observations 2016–2026 (Iowa Environmental Mesonet) · FAA NASR. Machine access: data.json · llms.txt. Not for operational use.