Taejongdae is famous for the ritual of praying for rain, performed when there are droughts, and rain which falls down on the 10th day of lunar May is called the “Taejong Rain“.
If it rained on the 10th day of the 5th moon, the farmers were glad as it was a sign of a good crop year and the rain was called King Taejong’s rain. This day is the death anniversary of Taejong, the third king of the Joseon Dynasty. As he lay dying there was a drought. He was sorry about it and said, “If I die may I go to the Emperor of Heaven and ask him for rain for our people”, and when the king died it suddenly started raining. After that the people called any rain on this day Taejong’s rain.
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Precipitation in Seoul on 10 May 2013 the 10th day of the 5th month
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Precipitation in Seoul on 18 June 2013 the 10th day of the 5th moon (Lunar calendar) 
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King Taejong’s Rain
by Paul in Uijeongbu (samedi)
LiveJournal
http://samedi.livejournal.com/364098.html
King Taejong (May 18, 1367 – May 10, 1422) was the third king of the Joseon Dynasty in Korea and the father of King Sejong the Great.
太宗は、1422年、55歳で薨去した。薨去する際、当時大旱魃が発生しており民たちの苦痛がひどくなることを心配して「余が死んで鬼になれば神々に私の民たちを助けてくれと頼もう」という遺言を残した。そして太宗が薨去すると直ちに空から雨が降った。その後、太宗の命日である5月10日がくるたびに雨が降り出すので、人々はこの雨を「太宗雨」と呼んだ。