Tillamook: One of the Wettest Cities in Oregon
Tillamook is legendary for rain. The city averages over 90 inches of annual precipitation — more than Seattle, Portland, and most other Pacific Northwest cities combined. The Tillamook State Forest and Coast Range funnel Pacific moisture directly into the valley, creating sustained, heavy rainfall events that can last for days.
This extreme volume of water means gutter systems in Tillamook work harder than almost anywhere in the country. Standard 5-inch gutters are marginal here — we typically recommend 6-inch profiles with oversized downspouts to handle peak flow rates during the heaviest storms. Undersized systems simply overflow, defeating their purpose entirely.
The Tillamook area's dairy farmland and surrounding forests add organic debris to the mix. Alder, Sitka spruce, and western hemlock produce needles, leaves, and moss that accumulate in gutters throughout the year. The constant moisture means moss grows on rooflines year-round, continuously shedding debris into troughs.