TODAY   |  October 20, 2013

Temperatures plunge across the country

A cold air front is making its way across the country, moving into the Midwest Sunday and then heading for the Northeast, signaling that fall may be officially here. TODAY’s Dylan Dreyer reports.

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>>> need to bundle up before you head outside this morning. that's because of well-below-average temperatures for this time of the year. dylan is watching that. hey, dylan.

>> good morning, craig. good morning, everyone. it is extremely cold across parts of the country, by about 10 to 15 degrees below average. we've got this huge dip in the jet stream , basically affecting right now the northern plains . but as we go through the next couple of days, you can see the cold air starts to spread eastward. in fact, in chicago, we are looking for temperatures to take a turn for the worse. we're going from 60s today, nice and comfortable, down into the 40s for high temperatures. so that means it's really cold in the morning. tomorrow, topping out only around 45 degrees after starting off at 27 tomorrow morning . so bundling up at the bus stop for sure. and then on tuesday, about 44 degrees. naturally, since that's moving into the midwest today, it will move into the northwest -- or the northeast, rather, as we go into the next couple of days. the nice warm fall we've seen so far in new york city will come to an end as well. craig?

>> all right. fall officially here,