Fog in Monrovia

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. dense fog (visibility under a mile) is rare here in August (10-year average).

Measured at Roberts International Airport (GLRB). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
GLRBRoberts International Airport31 h/yrclimatology

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 Monrovia fogs in

Fog here concentrates in January and February — about 31 hours in a typical year at GLRB, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the GLRB station page.

Fog season

January: ~12 hJanFebruary: ~9 hFebMarch: ~3 hMarApril: ~1 hAprMay: ~0 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~0 hSepOctober: ~0 hOctNovember: ~0 hNovDecember: ~4 hDec
Fog season runs December through March, peaking in January; fog is mostly a 6 AM–8 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.