Climate change in Snohomish County, Washington
Since 1979, Snohomish County, Washington has warmed 1.4°F, with about the same number of days above 90°F, about the same number of nights above 70°F and 7% more precipitation a year. Its climate in 1996–2025 is most like King County, WA's was in 1951–1980.
- Average temperature: +1.4°F
- Summer highs (Jun–Aug): +3.4°F
- Winter lows (Dec–Feb): +1.6°F
- Precipitation: +7%
- Wettest day of the year: +11%
- Longest dry spell: +6 days
- Days above 90°F: +0 days
- Nights above 70°F: +0 days
- Freezing nights: −13 days
- Frost-free season: +23 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +3.5°F
- Extreme fire-weather days: +27 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.