This weather has a price Keeping the median Valley County home comfortable runs roughly $536 a year in heating and cooling alone. See where it lands in the monthly bill

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.

Month	Avg high	Avg 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 15.57¢/kWh, Montana average $76

Approximate annual electric heating cost Lower where heating is gas rather than electric $461

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?

The weather station used for Valley County, ST MARIE, MT US, reports temperature and precipitation but not snowfall, so there is no snow normal to quote here. Precipitation that falls as snow is still counted in the 11.77 inches above, measured as melted water.

Sources

Temperature, precipitation and snowfall normals: NOAA National Centers for Environmental Information, 1991 to 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.
Annual figures on this page are the sum of that station's twelve monthly normals. NOAA also publishes a separately-computed annual normal, which can differ from the monthly sum by a few percent; we use the monthly series because the month-by-month breakdown above has to come from it.
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.