MINNEAPOLIS (WCCO) — Minnesotans may wake up Christmas morning to a shock of arctic air and, perhaps, subzero temperatures. Meteorologist Mike Augustyniak says there’s an 80 percent chance that temperatures on Christmas Eve and Christmas Day will be below average. Highs for both days could be in the single digits, with lows dipping below zero. The last week of December, including Christmas Day, is looking very cold. There is over an 80% chance for below normal temperatures.