Millegan, MT Climate

Climate Insight: Millegan, MT

An annual average temperature of 41°F, ranging from a mean daily high of 54°F to a mean daily low of 28°F is what the NOAA 1991–2020 climate normals report for Millegan, Montana. July is typically the warmest month of the year, while December is the coldest. That baseline comes from station USC00245712 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.

Millegan averages 19.6 inches of precipitation a year, with 149.3 inches typically falling as snow, and that matters as much to daily life here as temperature does. The frost-free season averages 87 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near June 11 and the first fall freeze near September 6. As for energy demand, 8,836 heating degree days and 95 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Millegan scores 34/100 (Below Average), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for December-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.