| 2024年 | 2025年 | 平年値 | |
| 5-19 | 20.6 | --- | 18.3 |
| 5-20 | 20.1 | --- | 18.1 |
| 5-21 | 19.3 | --- | 18.7 |
| 5-22 | 19.2 | --- | 19.1 |
| 5-23 | 19.1 | --- | 19.7 |
| 5-24 | 19.6 | --- | 20.5 |
| 5-25 | 20.5 | --- | 22.7 |
| 5-26 | 21.2 | --- | 20.5 |
| 5-27 | 21 | --- | 20.3 |
| 5-28 | 21.6 | --- | 20.5 |
| 5-29 | 21.5 | --- | 20.9 |
| 5-30 | 21.6 | --- | 20.4 |
| 5-31 | 21.5 | --- | 20 |
| 6-1 | 20.6 | --- | 20.4 |
| 6-2 | 20.3 | --- | 20.4 |