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United States › Oregon › Benton County › Climate Station CORVALLIS WATER BUREAU, OR US Distance 1.9 mi Normals 1991–2020

30-year climate normals

Benton County Climate and Weather Averages

Hottest month — August

83.0°

average daily high. The coldest month is January, averaging a low of 27.8°F.

Benton County gets 68.75" of precipitation a year and 5.3" of snow, and 51% 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 47.1° 27.8° 11.25" 2.0"
February 51.1° 28.3° 8.38" 1.7"
March 56.2° 30.5° 8.11" 0.5"
April 61.4° 33.0° 5.43" 0.0"
May 68.9° 38.6° 2.80" 0.0"
June 73.9° 42.6° 1.49" 0.0"
July 82.4° 45.7° 0.32" 0.0"
August 83.0° 45.7° 0.42" 0.0"
September 77.4° 42.3° 1.75" 0.0"
October 65.0° 36.3° 4.99" 0.0"
November 52.7° 30.7° 10.39" 0.2"
December 46.1° 28.3° 13.42" 0.9"

Rainfall by month

Benton County has a distinct wet season. 51% of the year's precipitation arrives in Nov, Dec, Jan.

January 11.25"
February 8.38"
March 8.11"
April 5.43"
May 2.80"
June 1.49"
July 0.32"
August 0.42"
September 1.75"
October 4.99"
November 10.39"
December 13.42"
Annual total 68.75"

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 139
Heating degree days How much heating the climate demands 5,668
Approximate annual cooling cost At 16.27¢/kWh, Oregon average $23
Approximate annual electric heating cost Lower where heating is gas rather than electric $323

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 Benton County, where electricity is one line of eight.

Common questions

What is the weather like in Benton County?

Benton County averages a high of 83.0°F in August and a low of 27.8°F in January. Annual precipitation is 68.75 inches, including 5.3 inches of snow.

When is the rainy season in Benton County?

The wettest stretch is Nov, Dec, Jan, which accounts for 51% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Benton County?

The average daily high in August, the hottest month, is 83.0°F. That drives 139 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Benton County?

Yes. Benton County averages 5.3 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CORVALLIS WATER BUREAU, OR US (USC00351877), 1.9 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.