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United States › Montana › Gallatin County › Climate Station BOZEMAN GALLATIN FLD, MT US Distance 18.7 mi Normals 1991–2020

30-year climate normals

Gallatin County Climate and Weather Averages

Hottest month — July

85.4°

average daily high. The coldest month is December, averaging a low of 9.7°F.

Gallatin County gets 13.43" of precipitation a year, and 47% 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 Precip
January 32.2° 10.2° 0.44"
February 35.6° 12.7° 0.42"
March 46.4° 21.6° 0.93"
April 55.3° 29.1° 1.68"
May 65.0° 37.6° 2.12"
June 73.8° 44.1° 2.54"
July 85.4° 49.4° 1.08"
August 84.1° 47.4° 0.94"
September 73.0° 39.5° 1.00"
October 57.5° 29.3° 1.10"
November 41.7° 18.2° 0.74"
December 31.7° 9.7° 0.44"

Rainfall by month

Gallatin County has a distinct wet season. 47% of the year's precipitation arrives in Apr, May, Jun.

January 0.44"
February 0.42"
March 0.93"
April 1.68"
May 2.12"
June 2.54"
July 1.08"
August 0.94"
September 1.00"
October 1.10"
November 0.74"
December 0.44"
Annual total 13.43"

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 232
Heating degree days How much heating the climate demands 8,244
Approximate annual cooling cost At 14.67¢/kWh, Montana average $34
Approximate annual electric heating cost Lower where heating is gas rather than electric $423

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 Gallatin County, where electricity is one line of eight.

Common questions

What is the weather like in Gallatin County?

Gallatin County averages a high of 85.4°F in July and a low of 9.7°F in December. Annual precipitation is 13.43 inches, with essentially no snow.

When is the rainy season in Gallatin County?

The wettest stretch is Apr, May, Jun, which accounts for 47% 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 Gallatin County?

The average daily high in July, the hottest month, is 85.4°F. That drives 232 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Gallatin County?

Effectively no. Measurable snowfall is rare in Gallatin County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BOZEMAN GALLATIN FLD, MT US (USW00024132), 18.7 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.