The inhabited Minnesota and North Dakota areas haven't seen multiple weeks of -30C/-22F in a very long time. Global Warming has affected these places as well. Not to say it doesn't reach <-22F at times (only down to -10F for a day or 2 in 2020 for Fargo, ND), but it's never weeks of that cold.

I belive in my lifetime from central ND there has not been that consistent cold of that for ~10 years but, a few weeks in a row of -10 were much more common. Although Grand Forks may be an exception as they are usually 5-10F cooler than central ND.

Fargo is in southern North Dakota. Look at the temperatures of the northern cities (e.g. Devils Lake, Duluth). The -30F days befor wind chill sucked.