Dearborn, MI Climate

Climate Insight: Dearborn, MI

In Dearborn, Michigan, the NOAA 1991–2020 climate normals put the annual average temperature at 50°F, ranging from a mean daily high of 59°F to a mean daily low of 41°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USC00202016, 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. Dearborn sees about 34.9 inches of precipitation a year, predominantly as rainfall. The frost-free season averages 181 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 27 and the first fall freeze near October 25. On the energy side, 6,138 heating degree days and 803 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Dearborn scores 68/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings July-driven heat, and deep winter brings January-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.