Harlowton, MT Climate

Climate Insight: Harlowton, MT

The NOAA 1991–2020 climate normals describe Harlowton, Montana as a location with an annual average temperature of 44°F, ranging from a mean daily high of 58°F to a mean daily low of 30°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.

Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Harlowton receives roughly 13.2 inches of precipitation each year, with 19.6 inches typically falling as snow. Growing-season length varies with elevation and microclimate, with the last spring freeze near May 23 and the first fall freeze near September 16. For energy use, 7,934 heating degree days and 230 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Harlowton scores 47/100 (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.