Bad weather led to a drop in Yellowstone National Park attendance from May 2009 when compared to May 2010, but don't be concerned: the 2010 numbers are up overall, and the May 2010 final tally is still the fourth-best in Park history.
Visitor numbers up 20 percent in May: NPS
For those worried about a slow season ahead in Yellowstone National Park, the May numbers should alleviate some concerns, as the National Park Service announces visitor numbers for May 2009 were up sharply over a year ago.