| 2023年 | 2024年 | 平年値 | |
| 12-13 | 16.2 | 15.6 | 16.1 |
| 12-14 | 16 | 15.4 | 16 |
| 12-15 | 16.1 | 15.2 | 15.8 |
| 12-16 | 16.1 | 15.2 | 15.7 |
| 12-17 | 15.3 | 15 | 15.4 |
| 12-18 | 14.8 | 14.8 | 14.7 |
| 12-19 | 14.8 | 14.3 | 14.7 |
| 12-20 | 14.6 | 14 | 14.6 |
| 12-21 | 14.4 | 14 | 14.7 |
| 12-22 | 14.5 | 13.5 | 14.6 |
| 12-23 | 13.9 | 13.4 | 14.4 |
| 12-24 | 13.7 | 13.2 | 14.2 |
| 12-25 | 13.8 | 13.1 | 14.1 |
| 12-26 | 13.6 | --- | 14 |
| 12-27 | 13.5 | --- | 13.9 |