summer or winter, this is a very busy place with great view, ( i personally like winter there, although it is great during summer time) one of the must see places in istanbul, whether you are walking up from the market through the cemetery or going up by cable car.they have great turkish tea and coffee, yet you have to be alert to take good seats next to side, the place is great and overlooks the golden horn.they offer toast and sandwiches prepared by a small shop a few meters away.always a good place to visit, try to visit on weekdays or else there is a very long waiting time up the cable cars. i personally prefer the walk up, long but has some fascinating views, never have i thought walking in a cemetery would be "nice" ! (make sure you stay hydrated)