| 2024年 | 2025年 | 平年値 | |
| 5-19 | 16.7 | 16.7 | 16.9 |
| 5-20 | 16.9 | 16.9 | 17 |
| 5-21 | 17.5 | 17 | 17.2 |
| 5-22 | 17.6 | 17.2 | 17.3 |
| 5-23 | 17.5 | 17.2 | 17.6 |
| 5-24 | 17.4 | 17.2 | 17.7 |
| 5-25 | 18 | 17.5 | 17.8 |
| 5-26 | 18.1 | 17.4 | 17.9 |
| 5-27 | 17.7 | 17.4 | 18.1 |
| 5-28 | 18.1 | --- | 18.2 |
| 5-29 | 18.4 | --- | 18.5 |
| 5-30 | 18.5 | --- | 18.7 |
| 5-31 | 18.5 | --- | 18.5 |
| 6-1 | 18.8 | --- | 18.9 |
| 6-2 | 19 | --- | 18.9 |