Our December temperature outlook has been updated – here's what to expect in the month ahead:
At a GlanceMuch of the East has a chance to see a somewhat colder-than-average first month of winter.December's temperature outlook has trended colder from the Great Lakes into the Northern Plains, according to an updated outlook released Wednesday by The Weather Company, an IBM Business, and Atmospheric G2.
Elsewhere, odds are tilted toward December being colder than average in much of the Northeast to as far south as the Tennessee Valley, northern Georgia and North Carolina. Greenland blocking is one of the reasons for the colder forecast in the northern tier, as well as the odds being tilted toward colder-than-average temperatures in much of the East.The setup involves a weather pattern that forms from blocking high pressure that sometimes develops near Greenland.
It's also referred to as the negative phase of the North Atlantic Oscillation, or NAO, as the graphic below illustrates.
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