Fog in Big Piney, WY

daily fog outlook & 2016–2026 climatology
Fog unlikely through Sunday (peak 2%). 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 Miley Memorial Field (KBPI). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KBPIMiley Memorial Field44 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 Big Piney fogs in

Fog here concentrates in January and December — about 44 hours in a typical year at KBPI, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KBPI station page.

Fog season

January: ~13 hJanFebruary: ~5 hFebMarch: ~7 hMarApril: ~2 hAprMay: ~2 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~0 hSepOctober: ~2 hOctNovember: ~4 hNovDecember: ~8 hDec
Fog season runs November through March, peaking in January; fog is mostly a 3 AM–9 AM phenomenon; typically thinning out by 11 AM; 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.