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In years past, I was able to convert an over-sized hallway closet into a small reloading room. Worked great, could lock it from our (then) small children, and it was air conditioned / heated (assisted by a small table fan).

The past eight years we lived aboard and cruised our boat. In 2006 we got back into pistol shooting / reloading. I was able to use a 2 ft x 2 ft area in the guest cabin for reloading. Granted I had to use a hand press vs bench press because of concerns about furniture, but I turned out 2,500 rounds of quality .45 ACP rounds in that small space in just five months (before selling the boat).

Moral of the story is I prefer / recommend use of a small area that's air conditioned / heated for your comfort as well as that of the reloading equipment and supplies. It's ideal if you can lock things up to keep children / grand kids safe (an open garage door might not offer that security). Even a small hallway closet in which you use the lower half for a work / storage area and sit on a chair placed in the hallway is a very workable arrangement.

NOTE: Really excellent hearing that garage humidty is not the problem I'd always imagined it to be. Nevertheless, I wouldn't be able to tolerate the summer conditions, although the winter time might be do-able. Those are just my limitations.