Japan Climate and Weather
The weather throughout the four main islands that make up Japan is generally temperate, with four distinct seasons. The weather can get very hot during the summer months, particularly in the South. May, June and July are the wettest months, and June, July and August are hotter and more humid. In the south winters are cool but sunny, but as one moves further north temperatures drop and snow falls. The island of Hokkaido in the far north of Japan is bitterly cold in the winter, with snow guaranteed.
http://www.wordtravels.com/Travelguide/Countries/Japan/Climate
