This is unusual for this time of year. Winters have been getting gradually warmer over the past two decades. Historically, it was this cold and colder for three weeks at a stretch, but not until January/February.
That was good because it killed the pine beetle infestation. The warmer winters let the little buggers survive and they took a heavy toll on our forests.
It's 'hunker in the bunker' weather, but this is farming and ranching country and the work goes on, made more difficult by the cold.
I served two years at the Canadian Army Arctic Warfare School at Churchill, Manitoba. Part of the graduation exercise was an overnight bivouac in a snow cave after a day on the trail pulling toboggans. The rule of thumb being that it takes 60% of your energy and resources just to stay alive. Fighting under those conditions is almost out of the question.
Ask Napoleon and Hitler .....