Both the World's temperature and precipitation were quite a bit below normal this year.
Nebuchadnezzar is the king of Babylon.
Jehoiachin succeeded Jehoiakim as King of Judah. Nebuchadnezzar took Jerusalem.
Edwin Thiele dates Jeconiah's reign of three months and ten days to 598/597 BC. According to 2 Chronicles 36:9, he became king upon the death of his father, Jehoiakim, at the age of eighteen. However, 2 Kings 24:8, in some Hebrew manuscripts, state that he became king at the age of eight.