For CH and othesr following
PatM has it dead-on with ANGC's "Winter" Season (which I believe is Oct 31 - May 1). Despite whatever vacation climate conditions exist now, Augusta, was - even for Atlantans - a winter retreat for the affluent, notoriously so in Jones' days of founding. It had amenities like the Bon Air and was a significant rail hub on the north-south lines to Florida.
While I'm sure the club has ample treasury to combat this now, that disgusting summer/early fall is murder on golf grass. Though the practice may not be continued these days, I recall reading they used to let the grass grow long and healthy to ankle/calf height during the summer off-season so a minimum of environmental damage was done to the turf during such months...e.g. I think its impossible to have the turf conditions they desire in a late spring to early autumn time.
But the more important point is the winter destination aspect.
Knowing Augusta though, I'll bet there is some aspect of the club that enjoys the irony of the Masters being the end of their season, when everyone is waking up, they are preparing for sleep.
cheers
vk