Fog in Hartford, CT

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 3 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

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

Measuring stations

stationairportfog hours/yrforecast
KBDLBradley International Airport59 h/yrverifying
KHFDHartford Brainard 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 Hartford fogs in

Fog here concentrates in December and March — about 59 hours in a typical year at KBDL, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KBDL station page.

Fog season

January: ~7 hJanFebruary: ~5 hFebMarch: ~7 hMarApril: ~2 hAprMay: ~2 hMayJune: ~2 hJunJuly: ~2 hJulAugust: ~3 hAugSeptember: ~4 hSepOctober: ~6 hOctNovember: ~5 hNovDecember: ~15 hDec
Fog season runs September through March, peaking in December; fog is mostly a 3 AM–9 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.