| 干旱类型 | 干旱频率 | 干旱等级 | |||
| 轻旱 | 中旱 | 重旱 | 特旱 | ||
| 春旱 | 36.5% | 47.8% | 34.8% | 17.4% | 0 |
| 夏旱 | 28.6% | 50.0% | 16.7% | 27.8% | 5.6% |
| 秋旱 | 31.7% | 45.0% | 35.0% | 15.0% | 5.0% |
| 冬旱 | 30.2% | 36.8% | 31.6% | 26.3% | 5.3% |