Well, here in "mid-America" people have their kids in school and so they can't think about moving until May/June, so, allowing a couple of months to shop for a home, then close, that puts you about April to start buying. Plus, houses don't LOOK as good with 2 feet of snow in front of them, so that's a drawback to winter sales.
I am a condo seller in NYC. I want a gay buyer. No kids, tons of cash. Eurotrash gay is best while euro still has a 17% premium.