| 2025年 | 2026年 | 平年値 | |
| 4-16 | 14.3 | --- | 14.2 |
| 4-17 | 19.1 | --- | 17.6 |
| 4-18 | 17.6 | --- | 16.5 |
| 4-19 | 18.1 | --- | 16.7 |
| 4-20 | 17.9 | --- | 16.7 |
| 4-21 | 19.1 | --- | 17.5 |
| 4-22 | --- | --- | 16.4 |
| 4-23 | --- | --- | 16.5 |
| 4-24 | --- | --- | 19.3 |
| 4-25 | --- | --- | 18.6 |
| 4-26 | --- | --- | 19.9 |
| 4-27 | --- | --- | 17.9 |
| 4-28 | --- | --- | 20.3 |
| 4-29 | --- | --- | 20.1 |
| 4-30 | --- | --- | 18.8 |