| Extremes | Index | R1 | R2 |
| CDD | ENSO3.4 | 0.085 | 0.544** |
| NAO | −0.511** | −0.46** | |
| AO | 0.276** | 0.29 | |
| IOD | 0.315** | 0.322* | |
| RX5day | SOI | 0.365** | 0.185** |
| NAO | −0.385** | −0.281** |