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United States › Washington › Snohomish County › Climate Station EVERETT SNOHOMISH AP, WA US Distance 25.9 mi Normals 1991–2020

30-year climate normals

Snohomish County Climate and Weather Averages

Hottest month — August

73.0°

average daily high. The coldest month is December, averaging a low of 36.0°F.

Snohomish County gets 33.37" of precipitation a year, and 40% 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 45.8° 36.6° 3.89"
February 47.9° 36.9° 2.84"
March 51.6° 39.0° 3.63"
April 56.1° 42.6° 2.67"
May 62.5° 47.6° 2.11"
June 66.4° 51.4° 1.89"
July 72.3° 54.7° 0.84"
August 73.0° 55.4° 0.98"
September 67.7° 52.3° 1.68"
October 57.7° 46.0° 3.35"
November 49.7° 39.9° 4.97"
December 44.6° 36.0° 4.52"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 40% falling in the wettest three months (Nov, Dec, Jan).

January 3.89"
February 2.84"
March 3.63"
April 2.67"
May 2.11"
June 1.89"
July 0.84"
August 0.98"
September 1.68"
October 3.35"
November 4.97"
December 4.52"
Annual total 33.37"

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 97
Heating degree days How much heating the climate demands 5,039
Approximate annual cooling cost At 14.95¢/kWh, Washington average $15
Approximate annual electric heating cost Lower where heating is gas rather than electric $264

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 Snohomish County, where electricity is one line of eight.

Common questions

What is the weather like in Snohomish County?

Snohomish County averages a high of 73.0°F in August and a low of 36.0°F in December. Annual precipitation is 33.37 inches, with essentially no snow.

When is the rainy season in Snohomish County?

The wettest stretch is Nov, Dec, Jan, which accounts for 40% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Snohomish County?

The average daily high in August, the hottest month, is 73.0°F. That drives 97 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Snohomish County?

Effectively no. Measurable snowfall is rare in Snohomish County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station EVERETT SNOHOMISH AP, WA US (USW00024222), 25.9 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, Washington residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.