C值 | 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
连续无降水日/d | 当天 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | >10 |