Lake Superior has a pleasant effect on local temperatures. The lake modifies local temperatures resulting in cooler summers and warmer winters. Lake Superior is often referred to as the "Great Air Conditioner" for its ability to temper the summer climate in Duluth. The proximity of the lake to the city also results in lower frequency of severe storms.
The Duluth climate is mild during the summer, when temperatures tend to be in the 60's- 70's,(F) and extremely cold in the winter when temperatures hover around 10(F) degrees!

The warmest month of the year is July with an average maximum temp of 75(F), and the coldest being January with an average minimum of 1.1 degree F

Temperature variations between night & day tend to be fairly limited during summer, with a difference that can reach 17 degree F, and in the winter an average difference of 18F.

Rainfall is fairly evenly distributed throughout the year, with the wettest month being July with an average rainfall of 3.73 inches.