is a city located in Aichi Prefecture in the Chūbu region of Japan. , the city had an estimated population of 61,647 in 26,559 households, and a population density of 2,457 persons per km². The total area of the city is . Geography Tsushima is located in far western Aichi Prefecture, on the alluvial plain of the Kiso Three Rivers. Climate The city has a climate characterized by hot and humid summers, and relatively mild winters (Köppen climate classification Cfa). The average annual temperature in Tsushima is 15.6 °C. The average annual rainfall is 1710 mm with September as the wettest month. The temperatures are highest on average in August, at around 27.9 °C with occasional typhoons , and lowest in January, at around 4.4 °C with occasional snow. The East Asian rainy season occurs in June. Demographics Per Japanese census data, the population of Tsushima has been relatively steady over the past 30 years. Surrounding municipalities Aichi Prefecture Aisai Kanie Ama History Middle Ages Tsushima developed as a monzen-machi catering to the pilgrimage traffic to the well-known Shinto shrine of Tsushima Jinja from the Muromachi period. Early modern period During the Sengoku period, the area was controlled by the Oda clan and subsequently in the Edo period was part of the holdings of the Owari-Tokugawa family of Owari Domain. Late modern period During the Meiji period, the area was organized into several villages under Ama District, Aichi Prefecture, including the village of Tsushima in 1871 with the establishment of the modern municipalities system. During the Meiji period, the area was a center for textile production. Tsushima was elevated to town status on October 1, 1889, and to city status on March 1, 1947. Contemporary history Tsushima was hit by the Ise-Wan Typhoon in 1959 which caused widespread damage and flooding. Government Tsushima has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 18 members. The city contributes one member to the Aichi Prefectural Assembly. In terms of national politics, the city is part of Aichi District 9 of the lower house of the Diet of Japan. External relations Twin towns – Sister cities International Sister cities Hercules（California, United States of America） since November 5, 1981 National Disaster Alliance city Kōnan（Aichi Prefecture, Chūbu region） since September 1, 2004 Fujioka（Gunma Prefecture, Kantō region） since September 1, 2004 Kasukabe（Saitama Prefecture, Kantō region） since September 1,