CYQI — Yarmouth Airport
fog forecast & climatology · Yarmouth city page · full 10-year analysis →
Fog likely Saturday — 63% chance of fog (visibility under 1 mile) around 7 am Saturday, with the fog window roughly 11 am to 9 am local time.forecast cycle 2026-09-04T13:00:00Z · page rebuilt daily · live layers below update hourly
- Fog hours per year
- 560 h below CAT I minima (2016–2026 average)
- Fog season
- July and August
- Typical fog event
- ~2 h once it forms (middle half 1–5 h, n=1616)
- Data through
- 2026-08-15 · machine-readable data.json
When this airport fogs in
In a typical year Yarmouth Airport spends 560 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in July and August. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.
Fog season
Fog season runs May through September, peaking in July; fog is mostly a 9 PM–9 AM phenomenon; typically thinning out by noon; a typical event lasts about 2 hours once it forms local time · 10-yr average
Runway infrastructure
| end | approach lights | best approach | length | RVR |
|---|---|---|---|---|
| 15 | — | LPV | 5,000 ft | — |
| 24 | other ALS | LPV | 6,000 ft | — |
| 33 | — | LPV | 5,000 ft | — |
| 06 | other ALS | LPV | 6,000 ft | — |
From FAA NASR / curated AIP Canada research. Approach-light class and minima tier drive how low an approach can be flown — details in the chase board.
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.