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United States › Montana › Custer County › Climate Station MILES CITY F WILEY FLD, MT US Distance 19.5 mi Normals 1991–2020

30-year climate normals

Custer County Climate and Weather Averages

Hottest month — July

88.7°

average daily high. The coldest month is January, averaging a low of 8.9°F.

Custer County gets 12.88" of precipitation a year, and 53% 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 30.1° 8.9° 0.28"
February 34.7° 12.5° 0.26"
March 46.8° 22.5° 0.55"
April 58.1° 32.9° 1.54"
May 68.1° 42.9° 2.73"
June 78.6° 52.5° 2.51"
July 88.7° 59.6° 1.51"
August 87.4° 57.6° 0.91"
September 75.6° 46.9° 1.07"
October 59.0° 33.8° 0.97"
November 44.3° 21.2° 0.33"
December 33.1° 11.7° 0.22"

Rainfall by month

Custer County has a distinct wet season. 53% of the year's precipitation arrives in Apr, May, Jun.

January 0.28"
February 0.26"
March 0.55"
April 1.54"
May 2.73"
June 2.51"
July 1.51"
August 0.91"
September 1.07"
October 0.97"
November 0.33"
December 0.22"
Annual total 12.88"

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 731
Heating degree days How much heating the climate demands 7,566
Approximate annual cooling cost At 14.67¢/kWh, Montana average $107
Approximate annual electric heating cost Lower where heating is gas rather than electric $388

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 Custer County, where electricity is one line of eight.

Common questions

What is the weather like in Custer County?

Custer County averages a high of 88.7°F in July and a low of 8.9°F in January. Annual precipitation is 12.88 inches, with essentially no snow.

When is the rainy season in Custer County?

The wettest stretch is Apr, May, Jun, which accounts for 53% 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 Custer County?

The average daily high in July, the hottest month, is 88.7°F. That drives 731 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Custer County?

Effectively no. Measurable snowfall is rare in Custer County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MILES CITY F WILEY FLD, MT US (USW00024037), 19.5 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.