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United States › Montana › Sweet Grass County › Climate Station BIG TIMBER, MT US Distance 1.5 mi Normals 1991–2020

30-year climate normals

Sweet Grass County Climate and Weather Averages

Hottest month — July

86.2°

average daily high. The coldest month is January, averaging a low of 19.5°F.

Sweet Grass County gets 16.93" of precipitation a year and 54.6" of snow, and 46% 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.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 38.1° 19.5° 0.73" 7.1"
February 40.0° 19.6° 0.65" 10.8"
March 49.3° 26.0° 0.98" 9.1"
April 56.8° 32.4° 2.18" 3.6"
May 66.6° 40.3° 3.06" 0.6"
June 75.8° 47.9° 2.63" 0.0"
July 86.2° 53.5° 1.38" 0.0"
August 84.9° 51.3° 0.99" 0.0"
September 74.1° 43.4° 1.31" 0.5"
October 59.0° 34.4° 1.51" 4.8"
November 45.9° 26.0° 0.78" 7.9"
December 37.2° 19.5° 0.73" 10.2"

Rainfall by month

Sweet Grass County has a distinct wet season. 46% of the year's precipitation arrives in Apr, May, Jun.

January 0.73"
February 0.65"
March 0.98"
April 2.18"
May 3.06"
June 2.63"
July 1.38"
August 0.99"
September 1.31"
October 1.51"
November 0.78"
December 0.73"
Annual total 16.93"

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 374
Heating degree days How much heating the climate demands 6,910
Approximate annual cooling cost At 14.67¢/kWh, Montana average $55
Approximate annual electric heating cost Lower where heating is gas rather than electric $355

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 Sweet Grass County, where electricity is one line of eight.

Common questions

What is the weather like in Sweet Grass County?

Sweet Grass County averages a high of 86.2°F in July and a low of 19.5°F in January. Annual precipitation is 16.93 inches, including 54.6 inches of snow.

When is the rainy season in Sweet Grass County?

The wettest stretch is Apr, May, Jun, which accounts for 46% 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 Sweet Grass County?

The average daily high in July, the hottest month, is 86.2°F. That drives 374 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sweet Grass County?

Yes. Sweet Grass County averages 54.6 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BIG TIMBER, MT US (USC00240780), 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, Montana residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.