| 2025年 | 2026年 | 平年値 | |
| 3-26 | 18.7 | --- | 18.7 |
| 3-27 | 19.9 | --- | 19.9 |
| 3-28 | 19.3 | --- | 19.3 |
| 3-29 | 18.2 | --- | 18.2 |
| 3-30 | 19.6 | --- | 19.6 |
| 3-31 | 20.6 | --- | 20.6 |
| 4-1 | 20.9 | --- | 20.9 |
| 4-2 | 19.4 | --- | 19.4 |
| 4-3 | 18.5 | --- | 18.5 |
| 4-4 | 18.3 | --- | 18.3 |
| 4-5 | 17.4 | --- | 17.4 |
| 4-6 | 18.1 | --- | 18.1 |
| 4-7 | 18.8 | --- | 18.8 |
| 4-8 | 20.6 | --- | 20.6 |
| 4-9 | 19.5 | --- | 19.5 |