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United States › Montana › Stillwater County › Climate Station COLUMBUS, MT US Distance 5.6 mi Normals 1991–2020

30-year climate normals

Stillwater County Climate and Weather Averages

Hottest month — July

85.4°

average daily high. The coldest month is January, averaging a low of 10.0°F.

Stillwater County gets 15.53" of precipitation a year and 47.6" of snow, and 45% 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 36.8° 10.0° 0.62" 7.0"
February 40.3° 13.0° 0.67" 8.8"
March 50.5° 20.6° 0.93" 7.7"
April 58.0° 28.2° 1.97" 4.5"
May 66.8° 37.2° 2.82" 0.5"
June 75.9° 44.9° 2.25" 0.0"
July 85.4° 50.0° 1.15" 0.0"
August 84.1° 47.7° 0.93" 0.0"
September 74.2° 39.2° 1.36" 0.2"
October 60.0° 29.4° 1.49" 3.8"
November 46.4° 18.8° 0.69" 5.9"
December 36.6° 10.7° 0.65" 9.2"

Rainfall by month

Stillwater County has a distinct wet season. 45% of the year's precipitation arrives in Apr, May, Jun.

January 0.62"
February 0.67"
March 0.93"
April 1.97"
May 2.82"
June 2.25"
July 1.15"
August 0.93"
September 1.36"
October 1.49"
November 0.69"
December 0.65"
Annual total 15.53"

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 241
Heating degree days How much heating the climate demands 7,736
Approximate annual cooling cost At 14.67¢/kWh, Montana average $35
Approximate annual electric heating cost Lower where heating is gas rather than electric $397

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 Stillwater County, where electricity is one line of eight.

Common questions

What is the weather like in Stillwater County?

Stillwater County averages a high of 85.4°F in July and a low of 10.0°F in January. Annual precipitation is 15.53 inches, including 47.6 inches of snow.

When is the rainy season in Stillwater County?

The wettest stretch is Apr, May, Jun, which accounts for 45% 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 Stillwater County?

The average daily high in July, the hottest month, is 85.4°F. That drives 241 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Stillwater County?

Yes. Stillwater County averages 47.6 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station COLUMBUS, MT US (USC00241938), 5.6 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.