Well, I usually buy my CD's from FYE 45 minutes away, I go there about once a month and they got a shitty black metal selection, but it's great for new death metal releases, I thought about ordering The Shadowthrone but I just had to get me The Bleeding by Cannibal Corpse when I went to FYE. So I'll probbaly listen to Now, Diabolical and Six Feet Under-Maximum Violence until I get Nile's new CD in July, and get The Shadowthrone or DMT around the Halloween/Winter Grim Time!
But seriously, I like to blast death metal from my car in the warm times and listen to black metal when it's cooler and colder, but that's just a generality, not a rule.
Because I'm in a black metal mood now and it's Hot outside now so it just depends on the mood generally.
I live in a small town in Western Tennessee where there isn't one CD store in the whole County! Ah! And at my college there's a CD store, only one in that county, but it doesn't sell death or black metal, so I go to the Mall and get me them.