| Month | ETo (mm/day) |
| January | 5.52 |
| February | 6.33 |
| March | 6.98 |
| April | 7.39 |
| May | 6.95 |
| June | 5.86 |
| July | 4.84 |
| August | 4.33 |
| September | 4.85 |
| October | 5.51 |
| November | 5.69 |
| December | 5.49 |