Variations on a theme: A heat wave there and a cold wave here

The media have lately been full of reports about the heat wave in the US West. There has been considerably less coverage on this:

It's June now, but residents in Minnesota's Northland area were waking up to sub-freezing temperatures.

A Duluth News Tribune report says the mercury dipped below 30 degrees in some areas Sunday morning.

The National Weather Service says International Falls reported a low of 30 degrees, a record low for the date. The previous record of 32 degrees was reached three times, most recently in 2009.