What season was it during the outbreak?

I know that it’s because of makeup ability and budget, but we rarely see walkers that aren’t fully clothed. Women in maxi skirts and cardigans, men in jackets and jeans. These are the most common outfits I’ve seen, at least varied. It’d make more sense if it were winter during the outbreak and that this is why people are dressed the way that they are, but with Lori being less dressed in the flashbacks when Rick was shot among other things makes me believe that it definitely wasn’t a winter season. I’m thinking spring or summer, but if anyone knows Georgia heat they know that almost all of the populous wouldn’t be dressed such as that. They’d die of heatstroke before the dead.