Why is the North Indian Ocean the least active cyclone basin?

The North Indian Ocean is the least active official tropical cyclone basin, contributing only seven percent of global tropical cyclones. Despite its lower frequency of storms, the region experiences some of the deadliest cyclones in the world because they frequently strike densely populated coastal areas. Cyclones in this basin generally form between April and December, with monitoring managed primarily by the India Meteorological Department.

What we know

• The North Indian Ocean basin contributes only seven percent of the world's tropical cyclones. [3]
• The North Indian Ocean is identified as the least active official tropical cyclone basin. [3]
• Cyclones in the North Indian Ocean have produced some of the world's deadliest impacts due to striking densely populated areas. [3]
• On average, three to four or four to five cyclonic storms form in the basin every season. [2, 4] · medium confidence

Where to go next

• what caused itWhat makes storms in this basin so deadly?
• how it workedHow does the India Meteorological Department monitor cyclones?
• a case in pointHow did the 2025 cyclone season unfold in the basin?
• compared withHow does activity compare to the South-West Indian Ocean basin?
• the bigger pictureWhat are the broader patterns of global tropical cyclone basins?
• an unexpected connectionHow do storms forming over land affect tropical cyclone seasons?While tropical cyclones typically form over warm ocean waters, this specific basin formally tracks systems that originate over land under the designation LAND.

Sources

• [1]2026 North Indian Ocean cyclone season (Wikidata Q137559111) · CC0 1.0
• [2]2026 North Indian Ocean cyclone season · CC BY-SA 4.0
• [3]North Indian Ocean tropical cyclone · CC BY-SA 4.0
• [4]2025 North Indian Ocean cyclone season · CC BY-SA 4.0
• [5]2026–27 South-West Indian Ocean cyclone season · CC BY-SA 4.0

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