Fog in Petersburg, AK

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 13 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Petersburg James A Johnson Airport (PAPG). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
PAPGPetersburg James A Johnson Airport137 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 Petersburg fogs in

Fog here concentrates in October and September — about 137 hours in a typical year at PAPG, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the PAPG station page.

Fog season

January: ~22 hJanFebruary: ~7 hFebMarch: ~7 hMarApril: ~6 hAprMay: ~5 hMayJune: ~3 hJunJuly: ~8 hJulAugust: ~13 hAugSeptember: ~23 hSepOctober: ~25 hOctNovember: ~9 hNovDecember: ~13 hDec
Fog season runs July through March, peaking in October; fog is mostly a 1 AM–8 AM phenomenon; typically thinning out by 11 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.