Roofing in Seattle: Climate & Local Conditions
Roofing in Seattle is shaped by 38 inches of annual rainfall, summer highs averaging 76°F and winter lows around 37°F, and exposure to moss and algae, prolonged moisture, biological growth, and gutter overload. Seattle's marine climate spreads its 38-inch annual rainfall across 150+ rainy days per year — a steady drizzle pattern that keeps roofs damp year-round.