From the Article:

It’s been miserably cold in Wisconsin this week, but just how cold has it gotten?

Here are the coldest temperatures recorded during the Arctic blast hitting the area over the last week.

The lowest air temperatures seen across Wisconsin over this cold spell were around minus 5 to minus 15 with those temperatures scattered throughout the state, according National Weather Service meteorologist John Gagan. These temperatures were recorded Sunday night into Monday morning.

There were cases of minus 15 seen across the state, but primarily in the southwest and west of Madison in areas like Mineral Point and Monroe.