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The Baiu is a cloudy and rainy period of early summer in Japan. All areas except the country's northernmost island, Hokkaido, experience this rainy season, which lasts from early June to late July. In Okinawa/Amami (the southernmost part of the Japanese Archipelago), the Baiu starts and ends about a month earlier than elsewhere. The period of the Baiu is operationally identified by the Japan Meteorological Agency (JMA) for each year and for 12 areas. JMA has been trying to identify a transition period of about five days for the start and end of the Baiu, although this is by nature a challenging task in some cases. The climatological date (from the average of data covering the period 1991-2020) at the center of each transition period is shown in the table below.
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