Fog in Riverton, WY

daily fog outlook & 2016–2026 climatology
Fog unlikely through Sunday (peak 1%). dense fog (visibility under a mile) is rare here in August.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Central Wyoming Regional Airport (KRIW). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KRIWCentral Wyoming Regional Airport57 h/yrlive forecast

Fog is measured where instruments live — airports. Hours/yr = time below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), the aviation definition of seriously dense fog.

When Riverton fogs in

Fog here concentrates in January and December — about 57 hours in a typical year at KRIW, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KRIW station page.

Fog season

January: ~20 hJanFebruary: ~5 hFebMarch: ~4 hMarApril: ~3 hAprMay: ~1 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~1 hSepOctober: ~1 hOctNovember: ~8 hNovDecember: ~14 hDec
Fog season runs November through February, peaking in January; fog is mostly a 2 AM–10 AM phenomenon; typically thinning out by 1 PM; a typical event lasts about 1 hour once it forms local time · 10-yr average

Machine access: data.json · llms.txt · forecast verification. Not for operational use.