by hot and humid summers, and relatively mild winters (Köppen climate classification Cfa). The average annual temperature in Okaya is 10.6 °C. The average annual rainfall is 1281 mm with September as the wettest month. The temperatures are highest on average in August, at around 23.6 °C, and lowest in January, at around -1.9 °C.

Demographics

Per Japanese census data, the population of Okaya has declined over the past 50 years.

History

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