Nashville, IL Climate

Climate Insight: Nashville, IL

Nashville, Illinois runs an annual average of 55°F, ranging from a mean daily high of 65°F to a mean daily low of 45°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 USC00116011, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.

Nashville averages 42.2 inches of precipitation a year, with 11.7 inches typically falling as snow, and that matters as much to daily life here as temperature does. The frost-free season averages 202 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 7 and the first fall freeze near October 26. As for energy demand, 4,859 heating degree days and 1,304 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Nashville scores 78/100 (Good), 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 January-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.