| 2024年 | 2025年 | 平年値 | |
| 12-16 | 19.6 | 19.2 | 18.5 |
| 12-17 | 19.5 | 19.3 | 18.5 |
| 12-18 | 19.5 | 19.1 | 18 |
| 12-19 | 19.3 | 19.2 | 18 |
| 12-20 | 19.1 | 19.4 | 18.1 |
| 12-21 | 19.1 | 19.8 | 18 |
| 12-22 | 19 | 19 | 18 |
| 12-23 | 18.9 | 18.8 | 18 |
| 12-24 | 18.5 | 19.3 | 18.1 |
| 12-25 | 18.3 | 19.4 | 17.5 |
| 12-26 | 18.4 | 18.6 | 17 |
| 12-27 | 18.2 | 18 | 17.2 |
| 12-28 | 18.1 | 17.9 | 17 |
| 12-29 | 17.7 | 17.8 | 17.3 |
| 12-30 | 17.6 | --- | 17.4 |