Adams County Climate
Adams County, Washington
Avg Annual Temp
49.8°F
Annual Precip
11.4"
Annual Snowfall
15.2"
Extreme Heat Days
33.400000000000006
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Adams County Weather
Adams County mirrors national temperature trends
With an annual average of 49.8°F, Adams County sits slightly below the national median for temperature. Its semi-arid climate receives just 11.4 inches of precipitation, making it significantly drier than most American counties.
A dry outlier in Washington state
The county's average temperature nearly matches the state average of 49.9°F. However, its 11.4 inches of rainfall is a fraction of the 38.5 inches Washington typically sees annually.
Warmer and drier than northern neighbors
Adams County experiences more extreme heat than nearby regions, recording 33 days over 90°F annually. This makes it significantly warmer during the summer than neighbors like Chelan to the northwest.
Distinct seasons with hot, dry summers
Summers are intense with July averages hitting 71.0°F, while winters remain chilly at 32.2°F. The county sees a modest 15.1 inches of snowfall, concentrated in the brief winter months.
Prepare for heat and dust
High-efficiency cooling is a priority here given the 33 days of extreme heat each year. Residents should also invest in dust mitigation for the home due to the low annual precipitation.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.