Potosi, MO Climate

Climate Insight: Potosi, MO

An annual average temperature of 55°F, ranging from a mean daily high of 65°F to a mean daily low of 45°F is what the NOAA 1991–2020 climate normals report for Potosi, Missouri. July is typically the warmest month of the year, while January is the coldest. That baseline comes from station USC00236826 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.

Potosi averages 45.5 inches of precipitation a year, with 11.5 inches typically falling as snow, and that matters as much to daily life here as temperature does. The frost-free season averages 200 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 11 and the first fall freeze near October 28. As for energy demand, 4,900 heating degree days and 1,196 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Potosi scores 68/100 (Good), 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.