Chester, MT Climate

Climate Insight: Chester, MT

An annual average temperature of 41°F, ranging from a mean daily high of 55°F to a mean daily low of 27°F is what the NOAA 1991–2020 climate normals report for Chester, Montana. July is typically the warmest month of the year, while January is the coldest. That baseline comes from station USC00241692 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.

Beyond temperature, Chester averages 12.3 inches of precipitation annually, with 36.5 inches typically falling as snow - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 116 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 24 and the first fall freeze near September 17. Turning to energy use, 8,848 heating degree days and 257 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Chester scores 39/100 (Below Average), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings July-driven heat, and deep winter brings January-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.