ReturnPeriod Ilam Hamedan Kermanshah Baseline period Model’s baseline period Near future Baseline period Model’s baseline period Near future Baseline period Model’s baseline period Near future 2 -1.4 -1.5 -1.4 -1.5 -1.5 -1.6 -1.5 -1.4 -1.7 5 -1.8 -1.8 -1.7 -2.1 -2.0  -1.7 -1.9 -2.5 10 -2.0 -2.1 -2.0 -2.5 -2.4 -2.3 -1.9 -2.2 -3.0 20 -2.3 -2.3 -2.3 -2.9 -2.8 -2.6 -2.0 -2.5 -3.5 25 -2.4 -2.4 -2.4 -3.0 -3.0 -2.7 -2.0 -2.6 -3.7 50 -2.6 -2.6 -2.6 -3.3 -3.5 -2.9 -2.1 -2.9 -4.2 100 -2.9 -2.8 -2.9 -3.7 -4.2 -3.3 -2.2 -3.2 4.7 ReturnPeriod Khorramabad Sanandaj Zanjan Baseline period Model’s baseline period Near future Baseline period Model’s baseline period Near future Baseline period Model’s baseline period Near future 2 -1.6 -1.4 -1.4 -1.5 -0.6 -1.5 -1.7 -0.6 -1.4 5 -2.0 -1.8 -1.7 -1.9 -1.2 -1.9 -2.1 -1.1 -1.9 10 -2.3 -2.1 -2.0 -2.2 -1.7 -2.2 -2.3 -1.6 -2.2 20 -2.5 -2.4 -2.3 -2.5 -2.3 -2.4 -2.5 -2.0 -2.6 25 -2.6 -2.4 -2.4 -2.6 -2.4 -2.5 -2.6 -2.2 -2.7 50 -2.8 -2.7 -2.8 -2.8 -3.0 -2.8 -2.8 -2.6 -3.0 100 -2.9 -3.1 -3.2 -3.1 -3.6 -3.1 -2.9 -3.1 -3.4

Table 6: The values of 12-month drought in different return periods.