North Dakota colder than the North Pole

From the Grand Forks Herald, via Marathon Pundit:

Today, Grand Forks is supposed to reach a high temperature of zero degrees, with a nighttime temperature expected at about 21 below and wind chills of 25 to 35 below.

For a little perspective on how cold that is, according to the National Weather Service, today's forecast at the North Pole will be 18 degrees with calm winds and a nighttime low of 13 below. Also, the North Pole is in winter darkness, meaning that temperature is reached with virtually no sunlight.