Several stunning images captured by a Minnesota photographer illustrate just how cold it is at Lake Superior.

The pictures taken by Andrew Krueger showed large sheets of ice piled up along the shore as temperatures remained below freezing this week.

Scientists from the Great Lakes Environmental Research Laboratory said ice coverage was at its highest percentage in 35 years, according to USA Today.

“Persistent cold temperatures in the Midwest this winter have almost completely frozen over many of the Great Lakes,” the lab reportedly said in a press release.

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