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United States › Washington › Mason County › Climate Station CUSHMAN POWERHOUSE #2, WA US Distance 1.5 mi Normals 1991–2020

30-year climate normals

Mason County Climate and Weather Averages

Hottest month — July

75.6°

average daily high. The coldest month is February, averaging a low of 35.2°F.

Mason County gets 91.96" of precipitation a year and 4.4" of snow, and 52% 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 PrecipSnow
January 45.3° 35.7° 15.48" 1.3"
February 48.0° 35.2° 9.20" 1.2"
March 52.5° 37.2° 9.89" 0.1"
April 57.7° 40.1° 6.13" 0.0"
May 65.3° 45.8° 3.03" 0.0"
June 69.6° 50.1° 1.91" 0.0"
July 75.6° 54.0° 0.87" 0.0"
August 75.5° 54.0° 1.40" 0.0"
September 69.3° 49.9° 3.02" 0.0"
October 58.4° 44.0° 9.10" 0.0"
November 49.7° 38.6° 15.72" 0.1"
December 44.2° 35.2° 16.21" 1.7"

Rainfall by month

Mason County has a distinct wet season. 52% of the year's precipitation arrives in Nov, Dec, Jan.

January 15.48"
February 9.20"
March 9.89"
April 6.13"
May 3.03"
June 1.91"
July 0.87"
August 1.40"
September 3.02"
October 9.10"
November 15.72"
December 16.21"
Annual total 91.96"

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 123
Heating degree days How much heating the climate demands 5,106
Approximate annual cooling cost At 14.95¢/kWh, Washington average $18
Approximate annual electric heating cost Lower where heating is gas rather than electric $267

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 Mason County, where electricity is one line of eight.

Common questions

What is the weather like in Mason County?

Mason County averages a high of 75.6°F in July and a low of 35.2°F in February. Annual precipitation is 91.96 inches, including 4.4 inches of snow.

When is the rainy season in Mason County?

The wettest stretch is Nov, Dec, Jan, which accounts for 52% 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 Mason County?

The average daily high in July, the hottest month, is 75.6°F. That drives 123 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Mason County?

Yes. Mason County averages 4.4 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CUSHMAN POWERHOUSE #2, WA US (USC00451939), 1.5 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, Washington residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.