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United States › Oregon › Jefferson County › Climate Station MADRAS 2 N, OR US Distance 2 mi Normals 1991–2020

30-year climate normals

Jefferson County Climate and Weather Averages

Hottest month — July

87.1°

average daily high. The coldest month is December, averaging a low of 23.2°F.

Jefferson County gets 11.2" of precipitation a year and 14.1" of snow, and 37% of it falls in Nov, Dec, Jan.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 43.0° 24.3° 1.41" 5.3"
February 45.9° 25.1° 1.07" 2.2"
March 54.0° 28.4° 0.86" 1.2"
April 60.6° 31.2° 1.10" 0.1"
May 69.4° 38.6° 1.30" 0.0"
June 76.9° 44.3° 0.78" 0.0"
July 87.1° 49.5° 0.41" 0.0"
August 86.4° 49.6° 0.30" 0.0"
September 77.6° 43.3° 0.34" 0.0"
October 63.0° 35.1° 0.85" 0.0"
November 49.3° 28.3° 1.22" 1.1"
December 41.3° 23.2° 1.56" 4.2"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 37% falling in the wettest three months (Nov, Dec, Jan).

January 1.41"
February 1.07"
March 0.86"
April 1.10"
May 1.30"
June 0.78"
July 0.41"
August 0.30"
September 0.34"
October 0.85"
November 1.22"
December 1.56"
Annual total 11.2"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 366
Heating degree days How much heating the climate demands 6,185
Approximate annual cooling cost At 16.27¢/kWh, Oregon average $60
Approximate annual electric heating cost Lower where heating is gas rather than electric $352

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Jefferson County, where electricity is one line of eight.

Common questions

What is the weather like in Jefferson County?

Jefferson County averages a high of 87.1°F in July and a low of 23.2°F in December. Annual precipitation is 11.2 inches, including 14.1 inches of snow.

When is the rainy season in Jefferson County?

The wettest stretch is Nov, Dec, Jan, which accounts for 37% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Jefferson County?

The average daily high in July, the hottest month, is 87.1°F. That drives 366 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Jefferson County?

Yes. Jefferson County averages 14.1 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MADRAS 2 N, OR US (USC00355142), 2 miles from the county centroid.
  • Heating and cooling degree days — NOAA, same station and period.
  • Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Oregon residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.