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United States › Oregon › Marion County › Climate Station SILVER CREEK FALLS, OR US Distance 4 mi Normals 1991–2020

30-year climate normals

Marion County Climate and Weather Averages

Hottest month — July

76.3°

average daily high. The coldest month is December, averaging a low of 32.5°F.

Marion County gets 68.92" of precipitation a year, and 43% 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° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 42.7° 32.7° 8.83"
February 45.4° 32.9° 8.37"
March 49.8° 34.0° 8.09"
April 54.7° 36.9° 6.43"
May 62.8° 42.0° 4.40"
June 67.6° 45.8° 2.96"
July 76.3° 50.2° 0.66"
August 76.1° 49.9° 0.80"
September 70.1° 45.8° 2.27"
October 57.8° 40.5° 5.51"
November 47.1° 35.9° 9.39"
December 41.6° 32.5° 11.21"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 43% falling in the wettest three months (Nov, Dec, Jan).

January 8.83"
February 8.37"
March 8.09"
April 6.43"
May 4.40"
June 2.96"
July 0.66"
August 0.80"
September 2.27"
October 5.51"
November 9.39"
December 11.21"
Annual total 68.92"

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 99
Heating degree days How much heating the climate demands 5,992
Approximate annual cooling cost At 16.27¢/kWh, Oregon average $16
Approximate annual electric heating cost Lower where heating is gas rather than electric $341

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 Marion County, where electricity is one line of eight.

Common questions

What is the weather like in Marion County?

Marion County averages a high of 76.3°F in July and a low of 32.5°F in December. Annual precipitation is 68.92 inches, with essentially no snow.

When is the rainy season in Marion County?

The wettest stretch is Nov, Dec, Jan, which accounts for 43% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Marion County?

The average daily high in July, the hottest month, is 76.3°F. That drives 99 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Marion County?

Effectively no. Measurable snowfall is rare in Marion County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SILVER CREEK FALLS, OR US (USC00357809), 4 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.