Croatia is divided into two predominant climate regions--Continental and Mediterranean--although there are some variations within those climate zones. As everywhere, Croatia's climate is determined by its geography which is a mixture of mountains, plains, forests and a long littoral. Mediterranean Climate Croatia's coast and islands from Istria and Kvarner in the north through Dalmatia are governed by a Mediterranean climate although it's usually several degrees cooler in the northern Adriatic than in the south.