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In page Yahiko, Niigata:

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Yahiko has a Humid climate (Köppen Cfa) characterized by warm, wet summers and cold winters with heavy snowfall. The average annual temperature in Yahiko is 13.0 °C. The average annual rainfall is 2081 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.1 °C, and lowest in January, at around 1.3 °C.[1]