| 2025年 | 2026年 | 平年値 | |
| 5-11 | --- | 18.1 | 16.6 |
| 5-12 | --- | 18.5 | 16.9 |
| 5-13 | --- | 19.1 | 16.9 |
| 5-14 | --- | 20 | 16.8 |
| 5-15 | --- | 20.5 | 17 |
| 5-16 | 16.9 | 20.6 | 17 |
| 5-17 | 17.4 | 20.3 | 17.2 |
| 5-18 | 17.1 | 20 | 17.3 |
| 5-19 | 17.2 | 20.6 | 17.2 |
| 5-20 | 17 | 20.1 | 17.3 |
| 5-21 | 18 | 19.4 | 17.7 |
| 5-22 | 17.6 | 19.5 | 17.6 |
| 5-23 | 17.8 | 19.9 | 17.8 |
| 5-24 | 17.8 | 20 | 17.8 |
| 5-25 | 17.9 | 19.6 | 17.8 |