Associations differed from one another in response to climatic differences within the region of the formation. 群众之间的差异反映了在群系分布范围内的气候的差异。
Some systems for the classification of climates seek to define climatic units that will correspond to major formation-types. 一些对气候的分类系统倾向于以相应的主要群系型来范定气候的单位。