| 2025年 | 2026年 | 平年値 | |
| 4-6 | 12 | 14.9 | 12.9 |
| 4-7 | 12.6 | 14.5 | 13.5 |
| 4-8 | 12.7 | --- | 13.3 |
| 4-9 | 13.2 | --- | 13.2 |
| 4-10 | 13.6 | 13.3 | 13.8 |
| 4-11 | 13.3 | --- | 14 |
| 4-12 | 13.3 | --- | 13.3 |
| 4-13 | 12.8 | --- | 13.9 |
| 4-14 | 12.7 | 15.4 | 13.6 |
| 4-15 | 12.8 | 14.8 | 12.7 |
| 4-16 | 13 | 14.8 | 13.7 |
| 4-17 | 13.6 | 15.3 | 14.1 |
| 4-18 | 14.4 | 15 | 14.4 |
| 4-19 | 14.8 | 15.4 | 14.6 |
| 4-20 | 13.2 | 16.1 | 13.9 |