Fog in Gary, IN

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 4 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Gary/Chicago International Airport (KGYY). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KGYYGary/Chicago International Airport53 h/yrverifying

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 Gary fogs in

Fog here concentrates in January and December — about 53 hours in a typical year at KGYY, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KGYY station page.

Fog season

January: ~14 hJanFebruary: ~4 hFebMarch: ~5 hMarApril: ~4 hAprMay: ~3 hMayJune: ~5 hJunJuly: ~4 hJulAugust: ~4 hAugSeptember: ~5 hSepOctober: ~3 hOctNovember: ~4 hNovDecember: ~8 hDec
Fog season is January, February, March, April, June, July, August, September, November, December, peaking in January; fog is mostly a 11 PM–3 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 2 hours once it forms local time · 10-yr average

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