Glenwood, IA Climate

Climate Insight: Glenwood, IA

Based on station USC00133290 feeding NOAA's 1991–2020 climate normals, Glenwood, Iowa averages 51°F a year, ranging from a mean daily high of 63°F to a mean daily low of 39°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.

Glenwood averages 34.8 inches of precipitation a year, with 23.7 inches typically falling as snow, and that matters as much to daily life here as temperature does. The frost-free season averages 171 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 23 and the first fall freeze near October 11. As for energy demand, 6,188 heating degree days and 1,070 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Glenwood scores 59/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, July-driven heat peaks in summer, and January-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.