| 2025年 | 2026年 | 平年値 | |
| 4-8 | 12.5 | 12.5 | 12.6 |
| 4-9 | 11.8 | 13 | 12.5 |
| 4-10 | 12.1 | 13 | 12.5 |
| 4-11 | 12.3 | 13 | 13 |
| 4-12 | 12.4 | --- | 13.2 |
| 4-13 | 12.4 | 13.3 | 13.4 |
| 4-14 | 11.5 | --- | 13.5 |
| 4-15 | 11.5 | --- | 13.3 |
| 4-16 | 11.8 | 13.8 | 13.3 |
| 4-17 | 12.1 | 14 | 13.1 |
| 4-18 | 12.3 | 14 | 13.4 |
| 4-19 | 12.8 | 14.3 | 13.6 |
| 4-20 | 13.2 | 14.5 | 14 |
| 4-21 | 13.3 | 14.2 | 14.3 |
| 4-22 | 14 | 14.5 | 14.3 |