Fog in Wilmington, DE

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 1 hour of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

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

Measuring station

stationairportfog hours/yrforecast
KILGWilmington Airport46 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 Wilmington fogs in

Fog here concentrates in January and February — about 46 hours in a typical year at KILG, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KILG station page.

Fog season

January: ~7 hJanFebruary: ~6 hFebMarch: ~6 hMarApril: ~2 hAprMay: ~4 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~1 hAugSeptember: ~2 hSepOctober: ~7 hOctNovember: ~5 hNovDecember: ~6 hDec
Fog season runs September through May, peaking in January; fog is mostly a 2 AM–8 AM phenomenon; typically thinning out by 10 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.