How often does Japan have typhoons?
Roughly speaking, about four typhoons hit the country annually.
The average number of typhoons born in the western part of the North Pacific Ocean is 27 per year.
Not all of them head for Japan because of the influences of seasonal upper layer winds that move typhoons.
Typhoons in spring and winter go west on the trade winds and never land in Japan, but those in summer and autumn go around the west end of the high pressure system in the Pacific Occan, and in many cases move in the direction of Japan.