You can blame the weekend weather on me. The weather is ALWAYS strange when I'm at WDW. I've been there through hurricanes, tornado warnings, freezes (in an 8x10 foot tent, and the zipper froze shut so that we couldn't get out until the sun came up over the trees), and that really cold, wet week in Dec. 2002. Last December it was freezing the day we came home. I arrive Friday, and leave Tuesday. If you've planned to be there during that time, you may want to bring ponchos, boots, snow suits, etc.!
In the meantime, I've learned to love WDW when it rains. The rolling clouds make beautiful photo backgrounds, and the wimpiest of the "day guests" all stay home!
Beth