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Over the next several days, cold air will press southward; by New Year’s Day, lingering warmth will be confined to the South. Readings below -20°F will be common across Montana and North Dakota, with sub-zero temperatures reaching the central Plains and upper Midwest by the weekend. In the West, late-week freezes may occur in California’s Central Valley and the Desert Southwest. Periods of stormy weather will precede and accompany the colder air.
