| 2025年 | 2026年 | 平年値 | |
| 5-12 | 33.1 | 29.3 | 33.1 |
| 5-13 | 33.3 | 29.3 | 33.1 |
| 5-14 | 33.5 | 29.3 | 32.9 |
| 5-15 | 33.6 | 29.3 | 32.9 |
| 5-16 | 33.7 | 29.6 | 32.9 |
| 5-17 | 33.7 | 29.8 | 33 |
| 5-18 | 34.2 | 29.7 | 33.2 |
| 5-19 | 34.2 | 29.7 | 33 |
| 5-20 | 34 | 29.7 | 33 |
| 5-21 | 34.1 | 29.6 | 33 |
| 5-22 | 34 | 29.8 | 33.1 |
| 5-23 | 33.5 | 29.5 | 33.1 |
| 5-24 | 32.8 | 29.2 | 33 |
| 5-25 | 33.4 | 29.5 | 32.8 |
| 5-26 | 32.9 | 29 | 32.9 |