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In page Aga, Niigata:

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Aga has a Humid climate (Köppen Cfa) characterized by warm, wet summers and cold winters with heavy snowfall. The average annual temperature in Aga is 12.8 °C. The average annual rainfall is 1715 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.3 °C, and lowest in January, at around 0.5 °C.[1]