That's probably a good time to go.. it won't be unbelievably hot.. though at the same time you want training in really hot, uncomfortable conditions.. because we just don't fight wars in the temperate zones anymore.
I started my BMT on Dec 22nd and it kind of sucked. It would be cold as hell in the morning and we'd all wear our winter weight BDU's and Field Jackets. Marching back to the squadron in the afternoon and it would be hot as hell. South Texas sucks in the winter.
Everybody doesn't go to the desert. I didn't in 5 years Active Duty....but I got out before Gulf War II.
Lief, those queers are in the Navy. We play softball in the Air Force thankyouverymuch. Drunk softball.
(and yes, Lackland (San Antonio) is the only Air Force Enlisted basic training site)