| 2025年 | 2026年 | 平年値 | |
| 4-4 | 10.8 | 12.9 | 10.8 |
| 4-5 | 10.8 | 13.1 | 10.8 |
| 4-6 | 11 | 13 | 11 |
| 4-7 | 11.5 | 12.7 | 11.5 |
| 4-8 | 11.8 | 12.8 | 11.8 |
| 4-9 | 11.9 | 12.9 | 11.9 |
| 4-10 | 12.3 | 13 | 12.3 |
| 4-11 | 12.4 | 13.3 | 12.4 |
| 4-12 | 12.5 | 13.8 | 12.5 |
| 4-13 | 12.7 | 13.8 | 12.7 |
| 4-14 | 12.3 | 14 | 12.3 |
| 4-15 | 12.2 | --- | 12.2 |
| 4-16 | 12.2 | 14.2 | 12.2 |
| 4-17 | 12.5 | 14.3 | 12.5 |
| 4-18 | 12.6 | 14.4 | 12.6 |