Kerala monsoon's 60% station criterion explained: why some onsets are declared by morning bulletins
Kerala monsoon's 60% station criterion explained: why some onsets are declared by morning bulletins
IN · Published May 28, 2026
The India Meteorological Department (IMD) uses a specific '60% station criterion' to officially declare the onset of the Kerala monsoon, a crucial event for India's agriculture and economy.
This criterion requires at least 60% of designated weather stations in Kerala to report a minimum rainfall of 2.5 mm for two consecutive days.
This threshold ensures the declaration is based on widespread rainfall, not isolated showers.

Why It's Important?

The 60% station criterion is crucial because it provides a reliable and objective measure for determining the monsoon onset. It affects farmers across India, as the monsoon's arrival dictates planting schedules for key crops. Businesses involved in agriculture and related industries also rely on this information for planning. The general public is also affected, as the monsoon influences water availability, temperature, and overall living conditions. Accurate monsoon onset declarations are therefore vital for informed decision-making at all levels, from individual farmers to national policymakers.

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