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Monsoons blow from northeast India towards the sea during winter (November to April) but with the beginning of summer they begin to reverse their direction. During winter (October - November) with the apparent movement of sun towards the south, the low pressure trough over then northern plains becomes weaker which causes the monsoon wind to blow from northeast to south during this period.

In summer, areas of low pressure develop in north and northwest parts of India due to which winds from the high pressure area i.e. sea begin to blow towards the land masses. So, a shift in the development of monsoon trough or low pressure trough along with the change of season is the main reason for the reversal of wind direction in Indian subcontinent.