Grand Portage, MN Climate

Climate Insight: Grand Portage, MN

The NOAA 1991–2020 climate normals describe Grand Portage, Minnesota as a location with an annual average temperature of 38°F, ranging from a mean daily high of 48°F to a mean daily low of 28°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USC00213296, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.

Anyone planning to live, garden, or travel in Grand Portage should weigh precipitation alongside temperature: the annual average runs 30.6 inches, with 55.2 inches typically falling as snow. 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 24 and the first fall freeze near September 29. And on the energy front, 9,862 heating degree days and 85 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Grand Portage scores 44/100 (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.