After a warm September for millions of Americans, October is expected to feel much more fall-like across the north-central and northeastern United States, but the chilly weather may be replaced by milder temperatures for the start of winter. Near- or below-average temperatures are expected in October from the northern Plains into the Midwest and Northeast, according to the latest outlook from The Weather Company, an IBM Business. The greatest chance for colder-than-average temperatures will be in the upper Midwest, western Great Lakes and parts of northern New York and northern Vermont.