| 2024年 | 2025年 | 平年値 | |
| 12-4 | 18.1 | 17.3 | 17.4 |
| 12-5 | 17.8 | 17.4 | 17.3 |
| 12-6 | 17.5 | 17.2 | 17 |
| 12-7 | 17.1 | 17.2 | 16.9 |
| 12-8 | 16.9 | 17.1 | 16.7 |
| 12-9 | 16.8 | 16.7 | 16.4 |
| 12-10 | 16.3 | 16.6 | 16.4 |
| 12-11 | 16.2 | 16.6 | 16.3 |
| 12-12 | 16.1 | 16.3 | 16.2 |
| 12-13 | 16.2 | 16.3 | 16 |
| 12-14 | 16 | 16.2 | 15.8 |
| 12-15 | 15.8 | 15.9 | 15.5 |
| 12-16 | 15.7 | 15.8 | 15.7 |
| 12-17 | 15.5 | --- | 15.3 |
| 12-18 | 15.2 | --- | 15 |