The word monsoon has been derived from the Arabic word ‘mausim’ which means season. In this season the winds blow from land to sea for 6 months and from sea to land for 6 months. The break in the monsoon rainfall refers to the dry spells when the monsoon rain takes place only for a few days at a time. These breaks are related to the movement of the monsoon trough. When the axis of the monsoon trough lies over the plains, then the rainfall is heavier there. When the trough moves towards the Himalayas, the plains are dry but there is heavy rainfall occur over the mountains.