| 2025年 | 2026年 | 平年値 | |
| 4-3 | 18.5 | --- | 18.5 |
| 4-4 | 18.3 | --- | 18.3 |
| 4-5 | 17.4 | --- | 17.4 |
| 4-6 | 18.1 | --- | 18.1 |
| 4-7 | 18.8 | --- | 18.8 |
| 4-8 | 20.6 | --- | 20.6 |
| 4-9 | 19.5 | --- | 19.5 |
| 4-10 | 21 | --- | 21 |
| 4-11 | 20.2 | --- | 20.2 |
| 4-12 | 19.5 | --- | 19.5 |
| 4-13 | 19.1 | --- | 19.1 |
| 4-14 | 18.2 | --- | 18.2 |
| 4-15 | 19.7 | --- | 19.7 |
| 4-16 | 18.4 | --- | 18.4 |
| 4-17 | 19.5 | --- | 19.5 |