Mount Waialeale, the wettest place in America and one of the wettest places in the world. They get 430 inches of rain per year on average. Talk about a really wet spot. Sometimes, they can get up to +40 inches per a month. It is like having 10 years of Houston annual rainfall total fall every month.
The wettest place in the world are Mawsynram and Cherrapunji in India. Cherrapunji measured over 900 inches of rain in a year, including 366 inches in one month!


Houston area has seen +100 inches of rain per a year in 1973, 1979, and 2001.
http://en.wikipedia.org/wiki/Mount_Waialeale
http://en.wikipedia.org/wiki/Cherrapunji
http://en.wikipedia.org/wiki/Mawsynram