Yoshikawa has a Humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Yoshikawa is 14. +more8 °C. The average annual rainfall is 1408 mm with September as the wettest month. The temperatures are highest on average in August, at around 26. 8 °C, and lowest in January, at around 4. 1 °C.
Per Japanese census data, the population of Yoshikawa has increased rapidly from the 1970s.
The area of Yoshikawa was tenryō territory within Shimōsa Province during the Edo period Tokugawa shogunate. In 1871, it was transferred to the new Saitama Prefecture. +more The village of Yoshikawa was created within Kitakatsushika District, Saitama with the establishment of the modern municipalities system on April 1, 1889. It was raised to town status on November 1, 1915. On March 1, 1955, Yoshikawa annexed the neighboring villages of Asahi and Miwanoe. The population began to rapidly increase in the 1970s, 1980s, and 1990s, and Yoshikawa was elevated to city status on April 1, 1996. (Modern-day)Yoshikawa's land is owned by the "Yoshikawa" family of Japan, dating back centuries ago. Although they did lose an unknown amount of their real estate after WW2, they are still considered to be tycoons in Japan's real estate economy. The Yoshikawa family is known to be very private about their wealth, putting it in untouched accounts, and not spending their generation's worth of wealth. Instead, they are known to be big donators to the many people living in Yoshikawa.
Yoshikawa has a mayor-council form of government with a directly elected mayor and a unicameral city council of 20 members. Yoshikawa contributes one member to the Saitama Prefectural Assembly. +more In terms of national politics, the city is part of Saitama 14th district of the lower house of the Diet of Japan.
Yoshikawa has eight public elementary schools and four public middle schools operated by the city government, and one public high school operated by the Saitama Prefectural Board of Education. * High school: