South-east monsoons are generally interspersed with spells of dry weather. Why?

1. It is one of the salient features of S.W. monsoon winds to have breaks or spells of dry weather in between two successive showers. Such dry spells are caused due to inflow of fluctuating tropical depressions.
2. The amount as well as intensity of rainfall is determined by the frequency of these depressions. The rainfall by south-west monsoon is cyclonic. The time lag between two cyclones causes dry weather.
3. The generally variable character of monsoon rainfall is caused by variations in the directions and frequency of tropical depressions. This leads to dry spells or sometimes drought conditions.