Chelle, I honestly don't know... I have a lot of yellowing of the tips of my leaves right now, and should still be a good month from harvest up here. Where you are, you might actually be getting pretty close to harvesting your garlic. And I do think the rain might have something to do with it, as well; a couple of days ago I dug up a couple of plants to see if there was some underground problem (rot, fungus, maggots, or ??) and although immature they looked fine. If yours has entire leaves turning brown, then I would say it likely is getting pretty close to done; when only the top 3 or 4 leaves are still green you need to dig it -- otherwise the bulbs will fall apart into individual cloves (still perfectly useable, just a hassle to deal with!).
Edited to add a link to a post with photos of the garlic I dug up a couple of days ago:
http://garden.org/thread/view_...
