Soon to be winter?

It's getting cold here now. Saturday it went up to 90 degrees but today it was in the 50s. It was a jeans-and-jacket kind of day. Where on earth did the cold front come from? On the one hand, I'm glad, because it's a nice change to wear jeans and jackets and not have to worry about getting sweaty and gross on your way to class. On the other hand...I miss the warmth! I hope we can salvage a few more days of this "Indian Summer," as my roomie says.