... The last record, set in 1967 and recorded at New Orleans International Airport, was 10.77 inches for the month, said Shawn O'Neil, a weather service meteorologist. By 9 p.m. Saturday, it was measuring 12.72 inches as the rain continued to fall, he said.
At Audubon Park, a century-old record was broken for Dec. 12. In 1909, 3.25 inches of rain fell. By 9 p.m. Saturday, the park had seen 5.55 inches of rain, O'Neil said ...
http://www.nola.com/news/index.ssf/2009/12/strong_thunderstorms_moving_th.html