Pomeroy, WA Climate

Climate Insight: Pomeroy, WA

An annual average temperature of 50°F, ranging from a mean daily high of 61°F to a mean daily low of 39°F is what the NOAA 1991–2020 climate normals report for Pomeroy, Washington. July is typically the warmest month of the year, while December is the coldest. That baseline comes from station USC00456610 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.

Anyone planning to live, garden, or travel in Pomeroy should weigh precipitation alongside temperature: the annual average runs 17.6 inches, with 8.4 inches typically falling as snow. The frost-free season averages 155 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 2 and the first fall freeze near October 4. And on the energy front, 5,928 heating degree days and 396 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Pomeroy scores 54/100 (Moderate), 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, July-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.