Rain started falling at 5:26 a.m. Wednesday in Waynesburg, the Greene County seat about 35 miles south of Pittsburgh.
The community celebrates Rain Day because legend has it that it nearly always rains on the 29th. Records show that had happened 111 times in the past 135 years.
A festival is held to commemorate the day each year, even when it doesn't rain. Tradition also calls for the mayor to make a bet with a celebrity about whether it will rain.
Wednesday's rain means Mayor Blair Zimmerman won a hat from Miss America 2009, Katie Stam.
