Fog in Valparaiso, IN

daily fog outlook & 2016–2026 climatology
Fog unlikely through Sunday (peak 8%). August typically brings about 9 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Porter County Municipal Airport (KVPZ). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KVPZPorter County Municipal Airport72 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 Valparaiso fogs in

Fog here concentrates in January and February — about 72 hours in a typical year at KVPZ, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KVPZ station page.

Fog season

January: ~15 hJanFebruary: ~9 hFebMarch: ~5 hMarApril: ~2 hAprMay: ~4 hMayJune: ~0 hJunJuly: ~3 hJulAugust: ~9 hAugSeptember: ~6 hSepOctober: ~4 hOctNovember: ~6 hNovDecember: ~9 hDec
Fog season is January, February, March, May, August, September, October, November, December, peaking in January; fog is mostly a 2 AM–7 AM phenomenon; typically thinning out by 10 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.