| 2024年 | 2025年 | 平年値 | |
| 12-9 | 15.6 | --- | 15.2 |
| 12-10 | 15.2 | --- | 15 |
| 12-11 | 15.1 | --- | 15.4 |
| 12-12 | 14.6 | --- | 15.4 |
| 12-13 | 14.5 | --- | 15.2 |
| 12-14 | 14.2 | --- | 15.2 |
| 12-15 | 14.7 | --- | 15.2 |
| 12-16 | 14.5 | --- | 15.2 |
| 12-17 | 14.3 | --- | 15.1 |
| 12-18 | 14.5 | --- | 14.4 |
| 12-19 | 13.6 | --- | 14.3 |
| 12-20 | 12.7 | --- | 14.2 |
| 12-21 | 12.6 | --- | 13.3 |
| 12-22 | 13.7 | --- | 13.2 |
| 12-23 | 13.3 | --- | 13.1 |