| 2025年 | 2026年 | 平年値 | |
| 1-17 | 9.1 | --- | 10.6 |
| 1-18 | 9.1 | --- | 10.7 |
| 1-19 | 9.2 | --- | 10 |
| 1-20 | 9.8 | --- | 10.4 |
| 1-21 | --- | --- | 9.9 |
| 1-22 | 9.8 | --- | 10.1 |
| 1-23 | 9.8 | --- | 9.4 |
| 1-24 | 10.1 | --- | 10.6 |
| 1-25 | 10.1 | --- | 9.3 |
| 1-26 | 10 | --- | 9.4 |
| 1-27 | 9.7 | --- | 9.9 |
| 1-28 | 9.8 | --- | 9.5 |
| 1-29 | 9.7 | --- | 9.6 |
| 1-30 | 9.8 | --- | 9.1 |
| 1-31 | 9.7 | --- | 9.7 |