Sherman County Climate
Sherman County, Oregon
Avg Annual Temp
49.2°F
Annual Precip
11.8"
Annual Snowfall
11.4"
Extreme Heat Days
24.549999999999997
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sherman County Weather
A Cold and Dry Continental Climate
Sherman County’s 49.2°F annual average is notably cooler than the national median. It is a dry region, receiving just 11.8 inches of precipitation per year.
Cooler and Drier than Western Oregon
The county falls below the Oregon average temperature of 50.5°F. Its 11.8 inches of rain is only about a third of the state's 37.4-inch average, reflecting its high-desert character.
Chillier Than Neighboring Morrow County
Sherman is significantly cooler than Morrow County, which averages 52.8°F. Both counties share a similar arid profile, receiving less than 12 inches of moisture annually.
Sharp Temperature Swings and Snowy Winters
The county endures 25 days of extreme heat over 90°F during the summer. Winters are cold and snowy, with a January average of 32.5°F and 11.5 inches of annual snowfall.
Insulate for Extreme Temperature Spans
Heavy-duty home insulation is vital to handle the range between 90°F summer days and freezing winter nights. Residents should also keep snow shovels ready for the 11.5 inches of annual accumulation.
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.