Are you sure about this being "unprecedented"? Because in Kentucky (much warmer winters than Michigan) in the 70s and 80s, on more than a few occasions we had temperatures in the -10 to -20 range. I especially remember one day, while at Ft. Knox for Basic and AIT, we had a wind chill of -67. For obvious reasons, we didn't go outside that day, expect to double time to the chow hall and back. Even here in Idaho, where I've lived for the last several years, we've had unofficial temperatures of -20 overnight.
Methinks all this talk about "unprecedented" and "record-setting" cold temperatures is nothing but eco-nut claptrap meant to shift the terms of the debate to gloBULL cooling rather than gloBULL warming. Besides, we've had at least one Ice Age and a Little Ice Age in Earth's history...I'm sure it's been even colder than this at some point.
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I keep an eye during these cold spells. It was -35 at our shack in Northern Minnesota a couple weeks ago. Still off the mark from the -48 it was when I went up there in the late 70’s. (And before we insulated it!)
It wasn’t that long ago that all 50 states had measurable snow.