CYLT — Alert Airport

fog forecast & climatology · Alert city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 21 hours of dense fog here (10-year average).

Fog hours per year
224 h below CAT I minima (2016–2026 average)
Fog season
May and October
Typical fog event
~2 h once it forms (middle half 1–3 h, n=370)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Alert Airport spends 224 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in May and October. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~16 hJanFebruary: ~7 hFebMarch: ~13 hMarApril: ~14 hAprMay: ~42 hMayJune: ~17 hJunJuly: ~27 hJulAugust: ~25 hAugSeptember: ~21 hSepOctober: ~28 hOctNovember: ~4 hNovDecember: ~16 hDec
Fog season is January, March, April, May, June, July, August, September, October, December, peaking in May; fog here can hit at any hour of the day; a typical event lasts about 2 hours 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.