Climate change in Lewis County, Washington
Since 1979, Lewis County, Washington has warmed 1.1°F, with 2 more days above 90°F, about the same number of nights above 70°F and 4% more precipitation a year. Its climate in 1996–2025 is most like Clackamas County, OR's was in 1951–1980.
- Average temperature: +1.1°F
- Summer highs (Jun–Aug): +3.5°F
- Winter lows (Dec–Feb): +1.3°F
- Precipitation: +4%
- Wettest day of the year: +13%
- Longest dry spell: +12 days
- Days above 90°F: +2 days
- Nights above 70°F: +0 days
- Freezing nights: −8 days
- Frost-free season: +15 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +3.5°F
- Extreme fire-weather days: +24 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.