There are some researchers work on the modeling extreme rainfall data in many parts of Thailand such as cite{Kham12} and cite{Khon13} applied the generalized extreme value distributions (GEVD) to the annual monthly maximum rainfalls in upper northern Thailand. cite{Keawa15}, cite{Keawb15} and cite{Busaba15} applied the GEVD to the annual daily and monthly maximum rainfalls in northeastern Thailand. However, no study has yet employed other distribution to model these data.