Fog in Viterbo

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 2 hours of dense fog here (10-year average).

Measured at Viterbo Airport (LIRV). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
LIRVViterbo Airport127 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 Viterbo fogs in

Fog here concentrates in November and December — about 127 hours in a typical year at LIRV, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the LIRV station page.

Fog season

January: ~10 hJanFebruary: ~9 hFebMarch: ~10 hMarApril: ~5 hAprMay: ~4 hMayJune: ~3 hJunJuly: ~1 hJulAugust: ~2 hAugSeptember: ~4 hSepOctober: ~13 hOctNovember: ~18 hNovDecember: ~15 hDec
Fog season runs October through April, peaking in November; fog is mostly a 5 AM–8 AM phenomenon; typically thinning out by 9 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.