Johnson Siding, SD Climate

Climate Insight: Johnson Siding, SD

Based on station USC00394343 feeding NOAA's 1991–2020 climate normals, Johnson Siding, South Dakota averages 45°F a year, ranging from a mean daily high of 59°F to a mean daily low of 31°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.

Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Johnson Siding receives roughly 21.6 inches of precipitation each year, predominantly as rainfall. The frost-free season averages 128 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 20 and the first fall freeze near September 25. For energy use, 7,540 heating degree days and 301 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Johnson Siding scores 64/100 (Good), 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.