Port Townsend, WA Climate

Climate Insight: Port Townsend, WA

Based on station USC00456678 feeding NOAA's 1991–2020 climate normals, Port Townsend, Washington averages 52°F a year, ranging from a mean daily high of 59°F to a mean daily low of 45°F. August is typically the warmest month of the year, while December is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.

Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Port Townsend receives roughly 19.1 inches of precipitation each year, with 0.6 inches typically falling as snow. The frost-free season averages 272 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 1 and the first fall freeze near November 28. For energy use, 4,837 heating degree days and 61 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Port Townsend scores 67/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, August-driven heat at the peak of summer, and December-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.