| 降水阈值(mm) | 采样后样本数 | 
| 无降水 | 2,724,136 | 
| 0.1 | 1,869,286 | 
| 1 | 1,050,201 | 
| 5 | 426,027 | 
| 10 | 212,528 | 
| 15 | 122,916 | 
| 20 | 75,308 | 
| 30 | 30,543 | 
| 40 | 12,124 | 
| 50 | 6291 | 
| 60 | 3260 | 
| 70 | 1769 | 
| 80 | 930 | 
| 90 | 476 | 
| 100 | 228 |