The Upper Peninsula has a humid continental climate (Dfb in the Köppen climate classification system).
The Great Lakes have a great effect on the larger part of the peninsula.
Winters tend to be long, cold, and snowy for most of the peninsula, and because of its northern latitude, the daylight hours are short—around 8 hours between sunrise and sunset in the winter.
Lake Superior has the greatest effect on the area, especially the northern and western parts.
Lake-effect snow causes many areas to get in excess of 100–250 inches (2.5–6.4 m) of snow per year—especially in the Keweenaw Peninsula and Gogebic County, and to a lesser extent Baraga, Marquette and Alger counties, making the western UP a prominent part of the midwestern snow belt.

Records of 390 inches (9.9 m) of snow or more have been set in many communities in this area.
The Keweenaw Peninsula averages more snowfall than any other location east of the Mississippi River.
Because of the howling storms across Lake Superior, which cause dramatic amounts of precipitation, it has been said that the lake-effect snow makes the Keweenaw Peninsula the snowiest place east of the Rockies.
Herman averages 236 inches (5.99 m) of snow every year.
Lake-effect snow can cause blinding whiteouts in just minutes, and some storms can last for days.
Hancock is found frequently on lists of the snowiest cities in America.

The banana belt along the Wisconsin border has a more continental climate since most of its weather does not arrive from the lakes.
Summers tend to be warmer and winter nights much colder.
Coastal communities have temperatures tempered by the Great Lakes.
In summer, it might be 10 °F (5.6 °C) cooler at lakeside than it is inland, and the opposite effect is seen in winter.
The area of the Upper Peninsula north of Green Bay though Menominee and Escanaba (and extending west to Iron River) does not have the extreme weather and precipitation found to the north.
The coldest temperature officially recorded in the Upper Peninsula was −48 °F (−44 °C) in Humboldt in January 1915.
The Upper Peninsula has a humid continental climate (Dfb in the Köppen climate classification system). The Great Lakes have a great effect on the larger part of the peninsula. Winters tend to be long, cold, and snowy for most of the peninsula, and because of its northern latitude, the daylight hours are short—around 8 hours between sunrise and sunset in the winter. Lake Superior has the greatest effect on the area, especially the northern and western parts. Lake-effect snow causes many areas to get in excess of 100–250 inches (2.5–6.4 m) of snow per year—especially in the Keweenaw Peninsula and Gogebic County, and to a lesser extent Baraga, Marquette and Alger counties, making the western UP a prominent part of the midwestern snow belt.
Records of 390 inches (9.9 m) of snow or more have been set in many communities in this area. The Keweenaw Peninsula averages more snowfall than any other location east of the Mississippi River. Because of the howling storms across Lake Superior, which cause dramatic amounts of precipitation, it has been said that the lake-effect snow makes the Keweenaw Peninsula the snowiest place east of the Rockies. Herman averages 236 inches (5.99 m) of snow every year. Lake-effect snow can cause blinding whiteouts in just minutes, and some storms can last for days. Hancock is found frequently on lists of the snowiest cities in America.
The banana belt along the Wisconsin border has a more continental climate since most of its weather does not arrive from the lakes. Summers tend to be warmer and winter nights much colder. Coastal communities have temperatures tempered by the Great Lakes. In summer, it might be 10 °F (5.6 °C) cooler at lakeside than it is inland, and the opposite effect is seen in winter. The area of the Upper Peninsula north of Green Bay though Menominee and Escanaba (and extending west to Iron River) does not have the extreme weather and precipitation found to the north. The coldest temperature officially recorded in the Upper Peninsula was −48 °F (−44 °C) in Humboldt in January 1915.
Upper Peninsula of Michigan