| month | J | F | M | A | M | J | J | A | S | O | N | D | Avg. |
| mm | 5.0 | 34.9 | 64.5 | 121.0 | 147.5 | 158.8 | 80.8 | 88.5 | 138.3 | 90.9 | 8.1 | 0.0 | 78.2 |