In the past, there were cases in which tsuyuake occurred in the Hokuriku region earlier than in the Chugoku region in which tsuyuiri occurred earlier and tsuyuake in the Kanto region was delayed largely compared to western Japan.
過去に、先に梅雨入りした中国地方より後に梅雨入りした北陸地方が先に梅雨明けしたり、関東地方の梅雨明けが西日本より大幅に遅れたりした例がある。