This study, the relationship between rainfall variability at 26 stations of data of Thai Meteorological Department with Niño 3 and Niño 3.4 for December, January and February (blue line), March, April and May (red line), June, July and August (green line) and September, October and November ( purple line) show in Figure 4.9 and Figure 4.10. The correlation coefficient between them is shown in Table 4.4 and Table 4.5. It was found that, the most negative relationships between DJF season with Niño 3 and Nino3.4 are -0.44457 and -0.49601 at Songkhla station. On the contrary, the most negative relationships between MAM season with Niño 3 and Nino3.4 are -0.57340 and -0.56338 at Bua Chum station. For JJA season, the most negative relationships to Niño 3 and Nino3.4 are -0.40614 at Chiang Mai station and -0.50243 at Suphan Buri station respectively. And for SON season, the most negative relationships to Niño 3 and Nino3.4 are -0.41779 at Phuket Airport station and -0.43166 at Trang Airport station respectively. Values estimated to be significant at 95% are bolded by Student’s t-test and the most values are bolded and red.