| 2024年 | 2025年 | 平年値 | |
| 12-6 | 20.3 | --- | 18.5 |
| 12-7 | 20.1 | --- | 18.8 |
| 12-8 | 19.4 | --- | 18.5 |
| 12-9 | 19.3 | --- | 18.2 |
| 12-10 | 19.4 | --- | 18.2 |
| 12-11 | 19 | --- | 18.3 |
| 12-12 | 18.7 | --- | 18 |
| 12-13 | 19.1 | --- | 17.8 |
| 12-14 | 18.6 | --- | 17.3 |
| 12-15 | 18.6 | --- | 17.3 |
| 12-16 | 18.8 | --- | 18.1 |
| 12-17 | 18.7 | --- | 17.8 |
| 12-18 | 18.6 | --- | 17.1 |
| 12-19 | 18.2 | --- | 17 |
| 12-20 | 18.1 | --- | 17.1 |