The Halloween 1991 blizzard brought more than major snowfall to Minnesota and the Upper Midwest.  Assistant State Climatologist Pete Boulay says that storm system ushered in some early arctic air:

“The low temperature on November 4th in the Twin Cities was three-below zero and there were below zeroes throughout central and parts of southern Minnesota. And that was probably the defining moment of the storm –  was how cold the air was behind it.  Those records might stand for a very long time.”

Boulay says the snow that was melting froze up and created bumpy, washboard-like road conditions.