| Sub-Basins | Rain Series | Albert Nile | River Aswa | Lake Albert | Lake Edward | Lake Kyoga | Lake Victoria | Victoria Nile |
| Year of Rainfall | Maximum | 1961 | 1983 | 1961 | 1996 | 1961 | 1961 | 1961 |
| Minimum | 1943 | 1943 | 1943 | 1979 | 1957 | 1957 | 1943 | |
| SEN’s T-Test | Area mean | −0.31 | −3.91 | −3.13 | −0.91 | −1.09 | −1.36 | 0.19 |