TV series/shows normally have a short break just before the Christmas break and tend to restart again around late January, early to mid February.....The Walking Dead, an example.
When it's coming back, they'll be loads of adverts and promos for it shown on Sky Living and Sky channels....
I think US TV stations don't run their shows during the Christmas period in case they get missed in the schedules, and still to be filmed on many occasions, so have a mid-season finale episode before the festive period starts.....Actors and crew can rest and continue a couple of months into the New Year.