While the weather may feel extreme, it's actually fairly typical this time of year.
We had another morning will below zero temperatures in Sioux Falls. It marked the fifth consecutive day with temps below zero for the city. By the looks of the seven-day forecast, this string could end Monday night.
Since 1990, we've had two other instances in December when the overnight lows stayed below zero, and in 1990, we had seven consecutive days. But in 2005 and 1996, we had a string of nine consecutive days.
An average December gives Sioux Falls six days with overnight lows below zero. So one more day puts us to average, and that day will come later this week.
Though it may seem like it could last forever, sooner or later, we'll get out of the deep freeze. That should happen late in the seven-day forecast.