It's their climate, mid-continent climate. The same situation exists in our North American mid continent cities such as Winnipeg, Fargo, etc or larger, Manitoba and North Dakota,
Minsk has a continental climate: warm summers and cold winters.
Temperate climates have cold winters and warm summers.
New England has warm summers and cold winters.
The temperate zone has warm summers and cool or cold winters.
It has warm summers and cold winters.
Humid Continental
Temperate
it has cold winters and warm summers
moderately cold winters, warm, humid summers
Southern California.
Missouri has hot, humid summers and cold winters. :]
Quite directly, they are temperate. Temperate means moderate. So the winters are cold but not too cold nor warm, and the summers are warm but not too hot or cool.