In this study, the study domain for analyses rainfall over Thailand, firstly focused over latitude 10°N during 10°N to 21°N and the period of this domain is June July and August (JJA), because JJA is rainfall season over this domain and secondly focused below latitude 10°N during 5°N to 10°N. This domain focused period is September October and November (SON), because this season is rainy season over this domain.