CYTH — Thompson Airport

fog forecast & climatology · Thompson city page · full 10-year analysis →
Fog unlikely through Saturday (peak 4%). 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
25 h below CAT I minima (2016–2026 average)
Fog season
September and October
Typical fog event
~1 h once it forms (middle half 1–2 h, n=121)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Thompson Airport spends 25 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in September and October. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~1 hJanFebruary: ~0 hFebMarch: ~2 hMarApril: ~0 hAprMay: ~1 hMayJune: ~1 hJunJuly: ~2 hJulAugust: ~2 hAugSeptember: ~6 hSepOctober: ~5 hOctNovember: ~3 hNovDecember: ~0 hDec
Fog season is March, July, August, September, October, November, peaking in September; fog is mostly a 5 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.