Besides May being a prime geocaching month weather-wise, there's also a couple of key events worth putting on your calendars if you haven't already.
First, on May 10th, is the World Wide Flash Mob III Event, which will take place at 10:00 A.M. pacific standard time all over the globe, and will only last for 15 minutes (so don't be late). More information can be found in this previous post. Look for an event near you.
Then, the mother of all mega-events, GeoWoodstock VI is scheduled for May 24th in Wheatland, California. It's so big, it even has its own website.
This should make for one gigantic month of geocaching. Hopefully, I'll get to see/meet many of you at one, or both, of these major events.