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Why does most precipitation in the Amur River basin fall during summer?

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Topographic map of the Amur River basin and its drainage network, covering parts of northeastern China, eastern Russia, Mongolia, and North Korea. The map uses color shading to indicate elevation, shows major rivers and tributaries, surrounding mountain ranges, swamps, marshes, and lakes, and includes a locator inset of the region within Asia. Major cities, railways, and dams are also marked. — Amur River The Amur River basin and its drainage network.

The precipitation in the Amur River basin is primarily driven by the monsoon winds that influence the climate of East Asia.1

During the summer months, the region is dominated by subtropical maritime air masses. These air masses bring significant moisture to the basin, resulting in peak precipitation levels during this time, with more than half of the annual total typically falling during the summer. This seasonal influx of moisture is also the primary source of the river's water, leading to significant flooding from May through October.12