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Story summary
- Meteorologists expect a frigid December across parts of the United States, especially the north and northeast.
- The National Weather Service says an arctic air mass will bring dangerously low temperatures, including subzero readings.
- Climatologist Judah Cohen forecasts extreme cold could reach from the Canadian Plains to the U.S. East Coast by mid-December.
- Florida is likely to cool, but significant snowfall remains unlikely as the polar vortex shapes the month.
