Ena, Gifu  Ena is located in the Tōnō region of southeastern Gifu Prefecture. The city has a climate characterized by characterized by hot and humid summers, and mild winters (Köppen climate classification "Cfa"). The average annual temperature in Ena is 13.9 °C. The average annual rainfall is 1988 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.4 °C, and lowest in January, at around 2.0 °C. Per Japanese census data, the population of Ena has remained steady over the past 40 years. The area around Ena was part of traditional Mino Province, and the name of "Ena" appears in Nara period records, including the "Nihon Shoki." During the Edo period, it was mostly controlled by Iwamura Domain, and Ōi-juku developed as a post town on the Nakasendō highway connecting Edo with Kyoto. During the post-Meiji restoration cadastral reforms, the area was organised into Ena District, Gifu. The city was founded on April 1, 1954 by the merger of two towns (Oi and Nagashima) and six villages (Tōnō, Sango, Takenami, Kasagi, Nakano, and Iiji), all from Ena District. On October 25, 2004, Ena absorbed the towns of Akechi, Iwamura, Kamiyahagi and Yamaoka, and the village of Kushihara (all from Ena District) to create the expanded city of Ena. Ena has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 18 members. Ena was noted for its pulp and paper industry for many years. Production of precision instruments dominates the manufacturing sector. Ena has 14 public elementary schools and eight public middle schools operated by the city government, and three public high schools operated by the Gifu Prefectural Board of Education. The prefecture also operates one special education school. Chubu University maintains a subsidiary campus in Ena.