Jefferson County Climate
Jefferson County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.5°F
Annual Precip
11.9"
Annual Snowfall
13.2"
Extreme Heat Days
35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
1,968
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jefferson County
Climate Verdict
Jefferson County has a cool, averaging 48.5°F annually, arid conditions receiving just 11.9 inches of precipitation annually, occasional hot days — 34.739999999999995 per year above 90°F, light snow averaging 13.2 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 33.6°F. summers are pleasantly cool with July averaging 67.5°F. The 34°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 Jefferson County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Jefferson County closely matches the Oregon statewide average temperature of 50.5°F, it is also noticeably drier, receiving 25.5 inches less precipitation than the state average.
Climate Profile
About Jefferson County Weather
Cool and Arid Interior Climate
Jefferson County's annual average temperature of 48.5°F is cooler than the national median. It is a very dry region, with just 11.9 inches of annual precipitation.
Drier than the Oregon Average
The county's temperature of 48.5°F sits just below the state average of 50.5°F. Its rainfall is significantly lower than the state's 37.4-inch average, totaling only 11.9 inches.
Warmer than Neighboring Deschutes
Jefferson is slightly warmer than its neighbor Deschutes County, which averages 46.0°F. Both counties share a similarly dry profile, receiving less than 14 inches of rain annually.
Hot Summers and Light Snow
The county experiences 35 extreme heat days above 90°F, with a July average of 67.5°F. Winter is cold but relatively light on precipitation, seeing only 13.2 inches of annual snowfall.
Focus on Cooling and Irrigation
Reliable air conditioning is necessary to handle the 35 days of extreme summer heat. Because of the low 11.9-inch annual rainfall, residents should plan for water-efficient landscaping and garden irrigation.
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.