Grantsville, UT Climate

Climate Insight: Grantsville, UT

In Grantsville, Utah, the NOAA 1991–2020 climate normals put the annual average temperature at 51°F, 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. As thirty-year averages computed from station USC00423348, these numbers smooth out year-to-year noise into a working baseline for a typical month.

Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Grantsville sees about 11.6 inches of precipitation a year, with 33.1 inches typically falling as snow. The frost-free season averages 165 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 2 and the first fall freeze near October 14. On the energy side, 6,044 heating degree days and 1,033 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Grantsville scores 49/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.