Jefferson County Climate
Jefferson County, Oregon
Avg Annual Temp
48.5°F
Annual Precip
11.9"
Annual Snowfall
13.2"
Extreme Heat Days
34.739999999999995
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.