CYDF — Deer Lake Airport

fog forecast & climatology · Deer Lake city page · full 10-year analysis →
Forecast feed initializing for this station. September typically brings about 3 hours of dense fog here (10-year average).

Fog hours per year
22 h below CAT I minima (2016–2026 average)
Fog season
October and August
Typical fog event
~1 h once it forms (middle half 1–2 h, n=141)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Deer Lake Airport spends 22 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in October and August. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~1 hJanFebruary: ~2 hFebMarch: ~1 hMarApril: ~1 hAprMay: ~0 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~4 hAugSeptember: ~3 hSepOctober: ~6 hOctNovember: ~1 hNovDecember: ~1 hDec
Fog season is February, August, September, October, peaking in October; fog is mostly a 6 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.