Helliconia Spring
From the back cover:

Imagine a world in a system of twin stars, where Winter is 600 ice-locked years and every Spring is the first remembered.  Imagine a People finding ruined cities beneath the melting snows.  Never dreaming they had built them.  And would again...
Life on other planets, Fiction, T.p. verso, A Berkley book"", English Science fiction
Brian W. Aldiss