Arctic curves in the context of dimer models are curves separating the rough region from the frozen/smooth regions. In case of the well-studied doubly periodic models, they are known to be algebraic. In this talk I will present a degree formula for arctic curves of doubly periodic models of the Aztec diamond that depends only on the topology of the frozen, rough and smooth regions, extending thereby the famous arctic circle theorem of Jockusch, Propp and Shor. I will then state a generalization of this formula to the case of arbitrary dimer models on bounded domains with a doubly periodic weight structure.