October is expected to be rather cold in the north-central United States before the pattern flips for November and December, yielding warmer temperatures in the northern states and colder temperatures in the southern states as winter begins. Colder-than-average temperatures are expected in October from the northern Rockies to the northern Plains and upper Midwest, with far below-average temperatures likely in the Dakotas, eastern Montana, northeastern Wyoming and western Minnesota, according to the latest outlook from The Weather Company, an IBM Business.