American Falls, ID Climate

Climate Insight: American Falls, ID

The NOAA 1991–2020 climate normals describe American Falls, Idaho as a location with an annual average temperature of 47°F, ranging from a mean daily high of 59°F to a mean daily low of 35°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from 2 weather stations, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.

Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. American Falls sees about 11.1 inches of precipitation a year, with 34.9 inches typically falling as snow. The frost-free season averages 141 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 14 and the first fall freeze near October 2. On the energy side, 6,997 heating degree days and 363 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, American Falls scores 49/100 (Moderate), 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.