The authors wish to acknowledge the Global Precipitation Climatology Centre (GPCC) for the data set and the developer of the NCAR Command Language (NCL) for analysis and graphic visualization tool. Finally, the authors sincerely thank the Joint Graduate School of Energy and Environment (JGSEE) and the Centre of Excellence on Energy Technology and Environment (CEE), Science and Technology Postgraduate Education, Research Development Office (PERDO) and Thailand Research Fund (TRF) under the grant: RDG5630015 for study support