Climate & Weather in Walla Walla
Walla Walla carries a real, distinct Hot-Summer Mediterranean climate (Köppen Csa) -- genuinely different in classification from Yakima's cold semi-arid climate even though both sit in Eastern Washington -- with a 78°F average summer temperature, a 43°F average winter temperature, and a specific, wine-industry-relevant 190-220 day growing season.
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Learn moreA real, distinct Hot-Summer Mediterranean climate
Walla Walla's Köppen Csa classification (Hot-Summer Mediterranean) is genuinely different from Yakima's cold semi-arid classification (Köppen BSk) built alongside this record -- short, hot, dry summers (78°F average) and cold, snowy winters (43°F average), with temperatures rarely dropping below 17°F or exceeding 102°F.
Genuinely less snow than Yakima
Walla Walla receives only about 8 inches of snow per year -- genuinely less than Yakima's 18 inches, even though both are Eastern Washington markets, a real microclimate distinction worth citing precisely rather than lumping all of Eastern Washington together.
A specific, wine-industry-relevant growing season
For wine-growing purposes specifically, the Walla Walla Valley's growing season runs a real, defined 190-220 days, from the last frost (typically April 1-10) through the first frost (typically October 21-31) -- a specific, sourced figure directly relevant to the region's premium wine identity, not a generic frost-free-days statistic.
Moderate annual precipitation
Annual precipitation runs about 17 inches, with December the wettest month at 3.7 inches -- moderate for Eastern Washington, more than Yakima's 11 inches but far less than Olympia's 56 inches or Bellingham's 37-42 inches.
Key takeaways
- Walla Walla's Hot-Summer Mediterranean climate (Köppen Csa) is genuinely distinct from Yakima's cold semi-arid climate, even within Eastern Washington.
- Genuinely less snow than Yakima -- about 8 inches/year vs. 18 inches.
- A specific, wine-industry-relevant 190-220 day growing season defines the region's premium wine identity.
- Annual precipitation runs a moderate 17 inches -- more than Yakima, far less than the Western Washington markets in this build.
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