| 調査年 | 採取月 | 平均気温 | 平均水温 | 全水深 | ｐＨ | ＤＯ | ＢＯＤ | ＣＯＤ | ＳＳ | 全窒素 | 全燐 | 塩素イオン |
| （℃） | （℃） | （ｍ） | (mg/l) | (mg/l) | (mg/l) | (mg/l) | (mg/l) | (mg/l) | (mg/l) | |||
| ’９１ | 夏 | 27.0 | 26.1 | 1.32 | 8.93 | 8.80 | 9.3 | 12.1 | 57.2 | 2.65 | 0.635 | 961.5 |
| ’９１ | 秋 | 23.3 | 21.9 | 1.42 | 9.20 | 10.47 | 8.9 | 10.3 | 30.2 | 3.05 | 0.370 | 973.8 |
| ’９１ | 冬 | 13.4 | 10.5 | 1.23 | 8.83 | 11.08 | 5.9 | 9.0 | 34.3 | 3.22 | 0.235 | 797.0 |
| ’９２ | 春 | 19.1 | 15.7 | 1.20 | 9.42 | 10.73 | 10.0 | 11.3 | 26.8 | 2.57 | 0.440 | 461.5 |
| ’９２ | 夏 | 28.1 | 25.8 | 1.28 | 9.47 | 11.83 | 10.6 | 13.5 | 45.8 | 2.77 | 0.468 | 815.3 |
| ’９２ | 秋 | 22.8 | 18.9 | 1.47 | 9.13 | 10.98 | 8.3 | 14.2 | 38.8 | 2.75 | 0.380 | 963.0 |
| ’９２ | 冬 | 14.1 | 9.2 | 1.37 | 9.20 | 13.50 | 8.6 | 9.8 | 26.7 | 3.20 | 0.193 | 360.7 |
| ’９３ | 春 | 17.8 | 13.5 | 1.45 | 9.23 | 12.75 | 8.8 | 11.5 | 29.5 | 3.28 | 0.280 | 902.8 |
| ’９３ | 夏 | 26.5 | 23.8 | 1.43 | 8.30 | 8.43 | 7.5 | 10.7 | 27.7 | 2.43 | 0.337 | 599.0 |
| ’９３ | 秋 | 25.0 | 21.4 | 1.53 | 8.87 | 10.27 | 8.4 | 9.1 | 30.7 | 3.47 | 0.263 | 508.0 |
| ’９３ | 冬 | 13.4 | 10.3 | 1.37 | 8.73 | 14.67 | 5.8 | 8.9 | 22.0 | 6.20 | 0.133 | 574.7 |
| ’９４ | 春 | 20.0 | 17.9 | 1.33 | 8.77 | 8.73 | 8.1 | 9.4 | 27.0 | 2.67 | 0.263 | 890.7 |
| ’９４ | 夏 | 28.5 | 27.2 | 1.43 | 9.07 | 8.90 | 11.4 | 14.7 | 68.0 | 2.93 | 0.597 | 666.0 |
| ’９４ | 秋 | 25.2 | 23.5 | 1.43 | 9.37 | 9.13 | 8.7 | 14.0 | 32.7 | 2.33 | 0.270 | 814.3 |
| ’９４ | 冬 | 11.0 | 8.5 | 1.53 | 9.03 | 13.00 | 9.7 | 11.0 | 34.0 | 3.70 | 0.213 | 930.3 |
| ’９５ | 春 | 19.5 | 15.2 | 1.30 | 9.40 | 12.67 | 6.9 | 13.3 | 39.0 | 3.40 | 0.263 | 586.7 |
| ’９５ | 夏 | 26.7 | 25.5 | 1.17 | 8.63 | 8.73 | 7.4 | 11.3 | 46.0 | 2.73 | 0.310 | 201.3 |
| ’９５ | 秋 | 23.5 | 20.8 | 1.47 | 9.00 | 9.87 | 7.1 | 12.3 | 41.3 | 2.17 | 0.307 | 1125.7 |
| ’９５ | 冬 | 5.5 | 5.8 | 1.37 | 9.50 | 12.33 | 8.5 | 13.7 | 32.3 | 4.27 | 0.273 | 945.0 |
春： ３，４，５月
夏： ６，７，８月
秋： ９，１０，１１月
冬： １２，１，２月
