CYOJ — High Level Airport

fog forecast & climatology · High Level city page · full 10-year analysis →
Fog unlikely through Friday (peak 3%). September typically brings about 14 hours of dense fog here.forecast cycle 2026-09-04T13:00:00Z · page rebuilt daily · live layers below update hourly

Fog hours per year
65 h below CAT I minima (2016–2026 average)
Fog season
September and November
Typical fog event
~1 h once it forms (middle half 1–2 h, n=301)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year High Level Airport spends 65 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in September and November. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~5 hJanFebruary: ~1 hFebMarch: ~1 hMarApril: ~2 hAprMay: ~1 hMayJune: ~4 hJunJuly: ~3 hJulAugust: ~7 hAugSeptember: ~14 hSepOctober: ~10 hOctNovember: ~12 hNovDecember: ~7 hDec
Fog season is January, June, August, September, October, November, December, peaking in September; fog is mostly a 2 AM–10 AM phenomenon; typically thinning out by noon; 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.