Grass Range, MT Climate

Climate Insight: Grass Range, MT

An annual average temperature of 46°F, ranging from a mean daily high of 59°F to a mean daily low of 33°F is what the NOAA 1991–2020 climate normals report for Grass Range, Montana. July is typically the warmest month of the year, while January is the coldest. That baseline comes from station USC00243727 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.

Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Grass Range sees about 17.9 inches of precipitation a year, with 50.1 inches typically falling as snow. The frost-free season averages 127 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 20 and the first fall freeze near September 24. On the energy side, 7,378 heating degree days and 314 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Grass Range scores 44/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.