Armour, SD Climate

Climate Insight: Armour, SD

In Armour, South Dakota, the NOAA 1991–2020 climate normals put the annual average temperature at 49°F, ranging from a mean daily high of 61°F to a mean daily low of 37°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USC00390296, these numbers smooth out year-to-year noise into a working baseline for a typical month.

Anyone planning to live, garden, or travel in Armour should weigh precipitation alongside temperature: the annual average runs 25.4 inches, with 34.4 inches typically falling as snow. The frost-free season averages 156 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 3 and the first fall freeze near October 6. And on the energy front, 6,747 heating degree days and 929 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Armour scores 59/100 (Moderate), 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.