However, an early onset over Kerala somewhat decreases probability of deficit

In the 27 years of late monsoon onset over Kerala, the Kerala and Mahe subdivision experienced a rainfall deficit in 78% of years in June and 67% of years during June-September.

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This means deficit was the most probable outcome in the subdivisions during late onset years. This broad trend—deficit being the most probable event—doesn't change for the five years when the monsoon arrived on June 1 or the 22 years when it was early. However, probability of deficit decrea