30-year climate normals

Beaverhead County Climate and Weather Averages

Hottest month — July

80.9°

average daily high. The coldest month is December, averaging a low of 6.5°F.

Beaverhead County gets 10.09" of precipitation a year, and 44% of it falls in Apr, May, Jun.

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	28.1°	7.8°	0.34"
February	31.9°	9.0°	0.56"
March	40.7°	18.1°	0.56"
April	50.2°	25.5°	1.00"
May	60.4°	33.2°	1.59"
June	68.9°	39.1°	1.84"
July	80.9°	44.0°	0.62"
August	79.2°	42.0°	0.69"
September	68.8°	34.7°	0.85"
October	53.4°	25.3°	0.86"
November	38.5°	14.6°	0.47"
December	28.4°	6.5°	0.71"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 44% falling in the wettest three months (Apr, May, Jun).

January 0.34"

February 0.56"

March 0.56"

April 1.00"

May 1.59"

June 1.84"

July 0.62"

August 0.69"

September 0.85"

October 0.86"

November 0.47"

December 0.71"

Annual total 10.09"

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 35

Heating degree days How much heating the climate demands 9,590

Approximate annual cooling cost At 14.67¢/kWh, Montana average $5

Approximate annual electric heating cost Lower where heating is gas rather than electric $492

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 Beaverhead County, where electricity is one line of eight.

Common questions

What is the weather like in Beaverhead County?

Beaverhead County averages a high of 80.9°F in July and a low of 6.5°F in December. Annual precipitation is 10.09 inches, with essentially no snow.

When is the rainy season in Beaverhead County?

The wettest stretch is Apr, May, Jun, which accounts for 44% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Beaverhead County?

The average daily high in July, the hottest month, is 80.9°F. That drives 35 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Beaverhead County?

Effectively no. Measurable snowfall is rare in Beaverhead County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station DILLON 18 WSW, MT US (USW00004137), 5.8 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.