Kaisei (開成町, Kaisei-machi) is a town located in Kanagawa Prefecture, Japan. As of 1 April 2021, the town had an estimated population of 18,335 and a population density of 2800 persons per km². The total area of the town is 6.56 square kilometres (2.53 sq mi). It is the smallest municipality in Kanagawa Prefecture in terms of area. Kaisei is located on the eastern bank of the Sakawa River, in western Kanagawa Prefecture. Kaisei has a Humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Kaisei is 13.6 °C. The average annual rainfall is 2221 mm with September as the wettest month. The temperatures are highest on average in August, at around 24.4 °C, and lowest in January, at around 3.2 °C. More information...
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