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United States › Montana › Valley County › Climate Station ST MARIE, MT US Distance 8.2 mi Normals 1991–2020

30-year climate normals

Valley County Climate and Weather Averages

Hottest month — July

84.5°

average daily high. The coldest month is January, averaging a low of 5.7°F.

Valley County gets 11.77" of precipitation a year, and 56% of it falls in May, Jun, Jul.

Temperature through the year

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

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 24.3° 5.7° 0.25"
February 27.9° 8.7° 0.20"
March 41.4° 19.7° 0.23"
April 56.1° 30.8° 0.82"
May 66.5° 41.1° 1.94"
June 74.7° 50.7° 3.08"
July 84.5° 56.8° 1.57"
August 83.9° 55.7° 1.32"
September 72.8° 45.9° 0.99"
October 56.5° 33.0° 0.95"
November 39.3° 20.3° 0.26"
December 27.2° 9.4° 0.16"

Rainfall by month

Valley County has a distinct wet season. 56% of the year's precipitation arrives in May, Jun, Jul.

January 0.25"
February 0.20"
March 0.23"
April 0.82"
May 1.94"
June 3.08"
July 1.57"
August 1.32"
September 0.99"
October 0.95"
November 0.26"
December 0.16"
Annual total 11.77"

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 486
Heating degree days How much heating the climate demands 8,452
Approximate annual cooling cost At 14.67¢/kWh, Montana average $71
Approximate annual electric heating cost Lower where heating is gas rather than electric $434

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 Valley County, where electricity is one line of eight.

Common questions

What is the weather like in Valley County?

Valley County averages a high of 84.5°F in July and a low of 5.7°F in January. Annual precipitation is 11.77 inches, with essentially no snow.

When is the rainy season in Valley County?

The wettest stretch is May, Jun, Jul, which accounts for 56% 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 Valley County?

The average daily high in July, the hottest month, is 84.5°F. That drives 486 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Valley County?

Effectively no. Measurable snowfall is rare in Valley County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ST MARIE, MT US (USW00094010), 8.2 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, Montana residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.