Edit: Halt and Catch Fire and Terriers, both of which I somehow managed to leave off my list, have been added below.
There was once a time when the summer slate of television consisted purely of reruns and the runts of the litter, the shows that networks didn't want to air in a fall slot but needed to burn off somewhere. That's no longer the case, and the TV season is no longer September to May. It's all year round. Summer is no longer a dead zone, with a slew of popular and critically acclaimed shows now airing in those four months.