| Month↓ Station→ | Bujumbura-Airport | Gitega-Zege | Imbo-SEMS | Musasa | Ruvyironza | Rwegura |
| January | 5.323 | 5.010 | 4.806 | 5.310 | 4.458 | 4.429 |
| February | 6.150 | 5.164 | 5.354 | 6.257 | 4.700 | 5.514 |
| March | 5.848 | 5.103 | 5.471 | 5.942 | 4.923 | 4.671 |
| April | 6.193 | 4.983 | 5.580 | 5.953 | 4.840 | 3.740 |
| May | 7.355 | 6.277 | 6.474 | 6.932 | 6.061 | 4.300 |
| June | 8.960 | 8.053 | 7.817 | 9.000 | 7.717 | 6.733 |
| July | 8.897 | 9.242 | 7.877 | 9.465 | 8.016 | 7.816 |
| August | 8.523 | 8.306 | 7.684 | 9.174 | 7.294 | 7.065 |
| September | 7.204 | 6.233 | 6.633 | 7.940 | 6.240 | 6.043 |
| October | 6.603 | 6.016 | 6.139 | 6.274 | 5.677 | 5.590 |
| November | 5.533 | 4.817 | 5.010 | 5.950 | 4.283 | 4.220 |
| December | 5.910 | 5.235 | 4.977 | 5.887 | 4.216 | 4.977 |
| Annual mean | 6.881 | 6.214 | 6.154 | 7.009 | 5.711 | 5.425 |