| Seasons | Before break | After break | Decrease (mm) | Increase (mm) | Deficit (%) | Excess (mm) |
| Average | Average | |||||
| GSS | 262 | 221 | 41 |
| 15 |
|
| GSP | 1365 | 1027 | 338 |
| 25 |
|
| PSS | 108 | 103 | 5 |
| 5 |
|
| PSP | 298 | 340 |
| 42 |
| 12 |