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During which months does most rainfall fall in the Brahmaputra valley?

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Map showing the course of the Brahmaputra River as it flows from southwestern China through northeastern India and into Bangladesh, with surrounding countries including Bhutan, Nepal, Myanmar, Pakistan, and Afghanistan labeled. The river's path is highlighted in blue, and major international boundaries are marked. — Brahmaputra River Brahmaputra River.

In the Brahmaputra valley, the majority of the annual rainfall occurs between June and early October, during the summer monsoon season. While this period accounts for the bulk of the precipitation, the region also experiences lighter rains from March to May.1