The result analysis of the eigenvectors and principal component time series (PC's) of MAM in the first mode show that the relation or the variance of the eigenvectors is positive over the northeastern and some area of southern region of Thailand but it is negative over the most region of Thailand, as shown in Figure 3.7(a). Figure 3.7(b) shows the values of standardized (PC’s), which have positive and negative values. It was found that there was the most positive in 1997 found over the northeastern and some area of southern region of Thailand there was high rainfall. On the contrary, there was the most negative in 2007 found over the most region of Thailand there was low rainfall.