| Year | Month | Butare P(mm) | Kansi P(mm) | Nyakibanda P(mm) | Save P(mm) |
| 1973 | January | 182.40 | 120.40 | 190.00 | 123.50 |
| February | 110.50 | 176.30 | 67.80 | 100.10 | |
| March | 84.70 | 42.70 | 61.40 | 90.50 | |
| April | 141.00 | 223.20 | 189.10 | 177.60 | |
| May | 228.60 | 211.00 | 252.30 | 334.80 | |
| June | 54.50 | 20.70 | 0.00 | 19.50 | |
| July | 0.00 | 0.00 | 0.00 | 0.00 | |
| August | 3.60 | 17.70 | 0.00 | 16.20 | |
| September | 216.30 | 182.60 | 166.50 | 133.80 | |
| October | 117.50 | 107.60 | 146.50 | 66.90 | |
| November | 154.00 | 104.80 | 109.80 | 163.90 | |
| December | 72.20 | 69.50 | 104.80 | 36.50 | |
| 1974 | January | 77.50 | 62.60 | 71.60 | 46.90 |
| February | 58.90 | 49.90 | 100.80 | 85.00 | |
| March | 253.80 | 152.40 | 167.30 | 164.90 | |
| April | 172.00 | 172.50 | 183.40 | 211.40 | |
| May | 117.20 | 138.90 | 119.20 | 142.70 | |
| June | 71.90 | 16.80 | 30.10 | 51.50 | |
| July | 21.20 | 17.60 | 29.70 | 49.40 | |
| August | 12.90 | 0.00 | 0.00 | 4.20 | |
| September | 90.30 | 69.20 | 114.80 | 117.10 | |
| October | 55.00 | 47.80 | 45.00 | 17.70 | |
| November | 178.40 | 162.30 | 104.60 | 179.90 | |
| December | 86.40 | 125.90 | 91.80 | 77.00 | |
| Annual Rainfall 1973 (mm) | 1365.30 | 1276.50 | 1288.20 | 1263.30 | |
| Annual Rainfall 1974 (mm) | 1195.50 | 1015.90 | 1058.30 | 1147.70 | |
| Avg. Annual Rainfall (mm) | 1280.40 | 1146.20 | 1173.25 | 1205.50 | |
| Thiessen Polygon (Km2) | 60.30 | 105.02 | 58.77 | 33.47 | |