Meteorologists don't have a detailed forecast yet, but many agree that December is shaping up to be an extremely cold month for parts of the United States.
According to the National Weather Service’s Climate Prediction Center, below-average temperatures are most likely across the northern and northeastern regions. Some experts also point to shifting patterns in the polar vortex, which could funnel some of the planet’s coldest air toward the United States.
The polar vortex, which is a band of strong winds that encloses a pool of freezing cold air in the Arctic, can cause extreme wintry weather in the US when it weakens or becomes unstable.
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