Sonnette, MT Climate

Climate Insight: Sonnette, MT

Sonnette, Montana runs an annual average of 45°F, ranging from a mean daily high of 60°F to a mean daily low of 30°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USC00247740, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.

Anyone planning to live, garden, or travel in Sonnette should weigh precipitation alongside temperature: the annual average runs 15.9 inches, with 29.1 inches typically falling as snow. The frost-free season averages 117 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 25 and the first fall freeze near September 19. And on the energy front, 7,749 heating degree days and 416 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Sonnette scores 39/100 (Below Average), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.