Sherman County Climate
Sherman County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
49.2°F
Annual Precip
11.8"
Annual Snowfall
11.5"
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
2,151
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Sherman County
Climate Verdict
Sherman County has a cool, averaging 49.2°F annually, arid conditions receiving just 11.8 inches of precipitation annually, occasional hot days — 24.549999999999997 per year above 90°F, light snow averaging 11.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.5°F. summers are pleasantly cool with July averaging 68.8°F. The 36°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Sherman County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Sherman County closely matches the Oregon statewide average temperature of 50.5°F, it is also noticeably drier, receiving 25.6 inches less precipitation than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.