| 2025年 | 2026年 | 平年値 | |
| 3-31 | 10.2 | 11.8 | 11.5 |
| 4-1 | 10.2 | 11.6 | 12.1 |
| 4-2 | 10.2 | 11.6 | 11.5 |
| 4-3 | 10.2 | 11.8 | 11.6 |
| 4-4 | 10.2 | 12 | 11.7 |
| 4-5 | 10.2 | 12.2 | 11.7 |
| 4-6 | 10.3 | 12.1 | 11.8 |
| 4-7 | 10.6 | 11.9 | 11.8 |
| 4-8 | 11 | 12 | 12.2 |
| 4-9 | 11 | 12.1 | 12.2 |
| 4-10 | 11.4 | 12.2 | 12.3 |
| 4-11 | 11.6 | 12.5 | 12.4 |
| 4-12 | 11.8 | --- | 12.4 |
| 4-13 | 12 | 12.9 | 12.6 |
| 4-14 | 11.6 | 13 | 13.2 |