How much of Japan’s annual rain fall comes during the typhoon months?



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    Typhoon months generally occur during the summer and early autumn, between May and October. Approximately 30 Typhoons occur over the Northwest Pacific Ocean each year; however, only seven or eight typhoons normally strike Okinawa with maybe three hitting the Japanese main islands.

    Photograph of a Typhoon

    Japan’s annual precipitation is roughly between 1,000 and 4,000 mm. The majority of this rainfall is concentrated between the months of June and September, or the rainy season. Approximately 70 to 80 % of Japan’s annual precipitation occurs during this time.

    If you would like more information, I’ve included a link to a .pdf brochure published by Japan’s Meteorolgical Agency

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