From figure 3.3 found that,in the DJF season all region Thailand have rainfall into scale values 0 except the south region have rainfall into scale values 1 to 4. In the MAM season all region Thailand have rainfall into scale values 1 to 5. In the JJA northern season region (above 10N) all region Thailand have rainfall into scale values 4 to 10. And in the SON season the south region shows the largest rainfall