Fog in Morristown, NJ

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 2 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Morristown Municipal Airport (KMMU). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KMMUMorristown Municipal Airport60 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 Morristown fogs in

Fog here concentrates in October and December — about 60 hours in a typical year at KMMU, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KMMU station page.

Fog season

January: ~5 hJanFebruary: ~5 hFebMarch: ~4 hMarApril: ~4 hAprMay: ~5 hMayJune: ~6 hJunJuly: ~3 hJulAugust: ~2 hAugSeptember: ~6 hSepOctober: ~7 hOctNovember: ~2 hNovDecember: ~7 hDec
Fog season is year-round, peaking in October; fog is mostly a 2 AM–6 AM phenomenon; typically thinning out by 9 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.