Maryland definitely has 4 defined seasons, unless we have a fluke like 2003... it snowed starting December 2002 to April 2003. Then it was Spring (chilly and rainy) all the way to October, when it warmed up to summerlike temps for a month (my dad was cutting grass in mid-November). And then it turned REALLY cold again in December 2003 though it didn't snow nearly as much as the previous one.