Description

Dfb: D = Continental  f = Fully humid  b = Warm summer

A humid continental climate is a climatic region typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers and freezing cold (sometimes severely cold in the northern areas) winters. Precipitation is usually distributed throughout the year but can have drier or dry seasons. 

Humid continental climates: Warm summer sub-types Dfb, Dwb, and Dsb. Source Wikicommons. Authors: Peel, M. C., Finlayson, B. L., and McMahon, T. A. (University of Melbourne) 2011.