| 2024年 | 2025年 | 平年値 | |
| 5-19 | 18.8 | 17.6 | 18.2 |
| 5-20 | 17.8 | 18 | 18.4 |
| 5-21 | 18.2 | 18.3 | 19 |
| 5-22 | 18.7 | 17.8 | 18.6 |
| 5-23 | 18.3 | 18.5 | 18.8 |
| 5-24 | 17.8 | 18.1 | 18.9 |
| 5-25 | 18.2 | 18.3 | 18.7 |
| 5-26 | 18.6 | 18 | 18.5 |
| 5-27 | 18.5 | 18.1 | 18.4 |
| 5-28 | 18 | 18.8 | 18.8 |
| 5-29 | 17.7 | 19.1 | 18.8 |
| 5-30 | 18.6 | 18.8 | 19.4 |
| 5-31 | 18.1 | 18.6 | 19.6 |
| 6-1 | 18.7 | 19 | 19.7 |
| 6-2 | 18.7 | --- | 19.8 |