It was suggested that the cooling trend pushed the polar air cap farther south, forcing the monsoon rains farther south too. Thus the rains fell in places that already had enough rainfall, or fell into the ocean. Also, monsoon rains, much needed in northern India, were affected in the same way.

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Normal limit of monsoon rains is indicated by broken line, and shaded arrows show normal wind patterns. But in recent years this limit has been pushed farther south (solid line and solid arrows). Much of area in between lines now not getting enough rain. Why? Normal cooler winds from north (dark wide band) have drifted farther south (lighter band), causing much of monsoon rains to fall into ocean areas instead of over land

NORTHERN LIMIT OF THE MONSOONS

EQUATOR