Ranzan is located in central Saitama Prefecture. The Higashimatsuyama Plateau extends to the central and northern parts of the town/
Surrounding municipalities Saitama Prefecture •
Fukaya •
Hatoyama •
Higashimatsuyama •
Kumagaya •
Namegawa •
Ogawa •
Tokigawa •
Yorii Climate Ranzan has a
humid subtropical climate (Köppen
Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Ranzan is 14.0 °C. The average annual rainfall is 1746 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.6 °C, and lowest in January, at around 2.5 °C. ==Demographics==