CYQM — Greater Moncton Roméo LeBlanc International Airport

fog forecast & climatology · Moncton city page · full 10-year analysis →
No fog signal in NWS guidance for the next 48 hours. September typically brings about 6 hours of dense fog here.forecast cycle 2026-09-04T13:00:00Z · page rebuilt daily · live layers below update hourly

Fog hours per year
69 h below CAT I minima (2016–2026 average)
Fog season
February and March
Typical fog event
~1 h once it forms (middle half 1–3 h, n=336)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Greater Moncton Roméo LeBlanc International Airport spends 69 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in February and March. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~7 hJanFebruary: ~9 hFebMarch: ~8 hMarApril: ~6 hAprMay: ~5 hMayJune: ~4 hJunJuly: ~7 hJulAugust: ~5 hAugSeptember: ~6 hSepOctober: ~5 hOctNovember: ~4 hNovDecember: ~2 hDec
Fog season runs January through November, peaking in February; fog is mostly a 2 AM–8 AM phenomenon; typically thinning out by 10 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.