First winter with a hive on my apartment roof in İzmir — sun all day, wind off the sea, no shade

İzmir, second year. Two of my hives are on family land outside the city but one sits on the flat roof of our apartment building, which seemed like a clever idea in April and has taught me a lot since. Summer nearly cooked them — the concrete and the bitumen roof surface held heat all night and they bearded until 2 am — and now I'm heading into my first winter up there and I don't know which problems change. What I think is different about a roof. There's no shelter at all, and the wind off the bay in winter is constant and sometimes violent. And I can't exactly plant a hedge. What I'm planning: strap the hive down properly to the parapet, build a low windbreak out of something heavy that won't itself become a missile, raise the hive off the concrete on a stand so water doesn't pool under the floor, and reduce the entrance against robbing. I don't think insulation is the issue in İzmir — the issue is exposure. Has anyone here wintered a rooftop colony? What did I miss, and is a roof genuinely a worse site in winter than in summer, or the other way round?