| 平成１６年 １月 |
結氷状況 （％） |
気温 （℃） |
| １/１ | ０ | ＋1.0 |
| ２ | ０ | 0 |
| ３ | ０ | -1.0 |
| ４ | ０ | -1.4 |
| ５ | ０ | -1.5 |
| ６ | ０ | -1.5 |
| ７ | 0 | -1.5 |
| ８ | 1 | -2.5 |
| ９ | 30 | -5.0 |
| １０ | 30 | -4.0 |
| １１ | 20 | -3.5 |
| １２ | 35 | -5.0 |
| １３ | 10 | -1.0 |
| １４ | 15 | -4.0 |
| １５ | 60 | -6.0 |
| １６ | ７５ | -5.5 |
| １７ | 60 | -2.0 |
| １８ | 50 | -3.5 |
| １９ | 10 | +2.0 |
| ２０ | 10 | -2.0 |
| ２１ | 10 | -2.0 |
| ２２ | 10 | -3.0 |
| ２３ | 50 | -5.0 |
| ２４ | 60 | -3.0 |
| ２５ | 65 | -5.0 |
| ２６ | 55 | -4.0 |
| ２７ | 60 | -2.0 |
| ２８ | 60 | -4.0 |
| ２９ | 60 | -3.0 |
| ３０ | 20 | +3.0 |
| ３１ | 10 | -2.0 |
| 平成１６年 ２月 |
結氷状況 （％） |
気温 （℃） |
| ２/１ | 25 | -3.0 |
| ２ | 10 | 0 |
| ３ | 5 | +3.0 |
| ４ | 0 | 0 |
| ５ | 0 | -2.0 |
| ６ | 20 | -3.5 |
| ７ | 30 | -4.0 |
| ８ | 40 | -4.0 |
| ９ | 45 | -4.0 |
| １０ | 50 | -4.0 |
| １１ | 55 | -3.0 |
| １２ | 40 | -2.0 |
| １３ | 20 | -2.0 |
| １４ | 10 | -0.5 |
| １５ | 5 | +1.0 |
| １６ | 0 | +3.0 |
| １７ | 0 | +1.0 |
| １８ | 0 | +1.0 |
| １９ | 5 | -2.0 |
| ２０ | 0 | 0 |
| ２１ | 0 | |
| ２２ | 0 | +5.0 |
| ２３ | 0 | |
| ２４ | 0 | |
| ２５ | 0 | +1.0 |
| ２６ | 0 | +1.0 |
| ２７ | 0 | -1.0 |
| ２８ | 0 | -1.5 |
| ２９ | 0 | +2.0 |