Seattle's Climate: Temperate Oceanic (Köppen Cfb)

Seattle, Washington, has a temperate oceanic (marine west coast) climate, classified as Köppen Cfb. Key features:

• Mild, wet winters: Coldest month (January) averages > 0 °C (32 °F); frequent rain.
• Cool, dry summers: Highs in the 70s °F (low 20s °C); low rainfall July–August.
• Persistent cloud/fog: Overcast or foggy ~52% of the year, especially spring/early summer.
• Year-round precipitation: ~37 inches (940 mm) annually, mostly as rain.

The Pacific Ocean moderates temperatures, preventing extremes.