Ōnan has a humid subtropical climate (Köppen climate classificationCfa) with very warm summers and cool winters. Precipitation is abundant throughout the year. The average annual temperature in Ōnan is 12.1 °C (53.8 °F). The average annual rainfall is 1,885.0 mm (74.21 in) with July as the wettest month. The temperatures are highest on average in August, at around 24.3 °C (75.7 °F), and lowest in January, at around 0.7 °C (33.3 °F).[2] The highest temperature ever recorded in Ōnan was 36.5 °C (97.7 °F) on 8 August 1994; the coldest temperature ever recorded was −16.3 °C (2.7 °F) on 28 February 1981.[3]
Climate data for Mizuho, Ōnan (1991−2020 normals, extremes 1978−present)
The area of Ōnan was part of ancient Iwami Province. During the Edo Period, the area was divided between of the holdings of Hamada Domain and direct territory of the Tokugawa shogunate. After the Meiji restoration, villages were established within Ōchi District, Shimane on April 1, 1889 with the creation of the modern municipalities system. The town of Ōnan was formed on October 1, 2004, from the merger of the towns of Iwami, Mizuho, and the village of Hasumi.
Government
Ōnan has a mayor-council form of government with a directly elected mayor and a unicameral town council of 13 members. Ōnan, collectively with the towns of Kawamoto and Misato, contributes one member to the Shimane Prefectural Assembly. In terms of national politics, the town is part of the Shimane 2nd district of the lower house of the Diet of Japan.
Economy
Ōnan is a very rural area, with an economy based on agriculture and forestry.
Education
Ōnan has eight public elementary school and three public junior high schools operated by the town government, and one public high school operated by the Shimane Prefectural Board of Education.
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