The aim of this study is to point out the basic climate modificators and types in Montenegro. Rarely could you find such a small area with more climate types and several subtypes and varieties as it is the case here. In the Part one of the study the most important climate modificators in Montenegro have been discussed, such as: mathematical - geographical position, relief dissection, atmospheric circulation and the Adriatic Sea. Atlantic and Mediterranean aquatories and Eurasian landmass play an important part in climate modification in the area of Montenegro. These vast areas represent the source of atmospheric action centres and air masses.