winter beer (thing)

In Ukranian, 'winter beer' is zimne piwo, pronounced zihm-neh pivo. That is why the square plastic signs hanging above numerous small bars and liquor stores throughout Chicago proclaim:

Cold Beer
Cerveza Fria
Zimne Piwo

This is something I learned right here on E2, after having seen the phrase constantly and expressing my intrigue at what it meant.