In monsoon climate region, rainfall occurs in specific season.

In monsoon climate region, rainfall occurs in specific season because- 

1. The differential heating and cooling of land and water creates low pressure on the land while the sea experiences high pressure. 

2. This is strongly related to shifting of the ITCZ. During the summer the ITCZ moves north to the latitudes of 20°-25°. 

3. Several months later, the moisture laden summer monsoon is replaced by dry north-east monsoon. 

4. By this time, the ITCZ has shifted to the southern hemisphere. 

5. In northern hemisphere, the winds move from sea to land bringing moisture along with them in summers and gives rainfall. 

6. In southern hemisphere same conditions prevail when there are winters in the northern hemisphere.