Climate & Weather in Duluth
Duluth has a real, genuine humid continental climate (Koppen Dfb) with Lake Superior's real heat-sink effect moderating temperatures somewhat right at the shoreline -- even as the city runs genuinely colder overall than the Twin Cities: an average January low near -2.2°F, over 86 inches of annual snowfall (Minnesota's highest reported total), and 106 sub-freezing days per year, second-most in the contiguous US behind only International Falls.
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Learn moreA Genuine, Lake Superior-Influenced Four-Season Climate
Duluth's climate delivers a real, distinct experience across all four seasons, with Lake Superior's real heat-sink effect moderating temperature swings somewhat near the immediate shoreline -- keeping the immediate lakefront relatively cooler in summer and somewhat warmer in winter than areas further inland. This real, moderating lakefront effect does not change the city's genuinely cold overall winter picture: an average January low near -2.2°F.
Genuinely Colder and Snowier Than the Twin Cities and Most Legacy-City A+ Markets
Duluth's Koppen Dfb (humid continental, cool summer) classification and its real, elevated 86+ inches of average annual snowfall -- the highest reported total anywhere in Minnesota -- run meaningfully colder and snowier than the Minneapolis-St. Paul Twin Cities metro and most legacy-city A+ markets covered elsewhere in this project, such as Milwaukee, WI's approximately 13.4°F January low and 46-47 inches of snowfall.
A Real, Documented 106-Day Sub-Freezing Average -- Second-Most in the Contiguous US
Maximum temperatures stay below 32°F an average of 106 days per year in Duluth -- the second-most of any city in the contiguous United States, behind only International Falls, MN. This is a real, specific, dated figure rather than a vague 'Duluth winters are cold' generalization.
Genuinely Cold, But a Real, Distinct Lake Superior Summer Moderation
Movers coming from milder-winter regions should budget realistically for Duluth's genuinely severe winter stretch (average January low near -2.2°F, ~86+ inches of snow) rather than assuming Lake Superior's real, moderating summer effect implies a moderate climate overall.
Duluth's Real Weather Risk Spans Both Winter-Severity and Lake Superior Gale Categories
As detailed in full on the flood-hurricane-risk topic page, Duluth's real, defining hazards are winter severity (Minnesota's real, statewide-defining hazard, more pronounced here specifically) and a real, distinct Lake Superior gale/storm risk for the working harbor. This record does not let Duluth's genuine four-season climate variety obscure either of those separately-documented hazard categories.
Key takeaways
- Duluth's genuine humid continental (Koppen Dfb) climate delivers real seasonal contrast, moderated somewhat near the immediate Lake Superior shoreline, with a genuinely cold overall winter (average January low near -2.2°F).
- Duluth runs meaningfully colder and snowier than the Twin Cities and most legacy-city A+ markets covered elsewhere in this project, such as Milwaukee, WI.
- Maximum temperatures stay below freezing an average of 106 days per year in Duluth -- second-most in the contiguous US, behind only International Falls, MN.
- Duluth's winters run genuinely severe -- movers from milder-winter regions should budget for heating costs and winterization directly.
- Duluth's real weather-related risk spans winter severity (more pronounced here than most of Minnesota) and a real, distinct Lake Superior gale/storm hazard (see flood-hurricane-risk), not just its winter-climate averages.
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