Mozi (about 400 BC): under King Jie 'sun and moon were out of time, cold and heat came mixed, the five grains scorched and died'
Mozi, Fei gong xia: 逮至乎夏王桀，天有誥命，日月不時，寒暑雜至，五穀焦死，鬼呼國，鶴鳴十夕餘. The oldest dated-by-author text here that remembers bad weather at the Xia's end; no year. Other early texts with no year: Guoyu, 'the Yi and Luo dried up and the Xia fell'; Lushi Chunqiu (239 BC), after Tang's victory 'a great drought, five years without a harvest', ended by Tang's prayer at Sanglin (the source of the current text's drought in Tang years 19-24). The ancient-text fragments of the Annals say only 'in Jie's last year the altar of the soil cracked'.
How it connects
This clue from people supports this hunch
The early books remember failed harvests, mixed cold and heat and a five-year drought at the Xia's end; the ice cores show four eruptions in 1561-1550 BC, about when Erlitou ended old memory of crop failure and drought
This clue from people is a clue for
Why did the Xia dynasty fall (about 1600 to 1530 BC), and do the omens told of its end remember a real eruption?
This clue from people we read it in
Mozi, Against Offensive War III (Fei gong xia), 5th-4th century BC, Chinese Wikisource
This clue from people we read it in
Wang Guowei, Guben Zhushu Jinian jijiao (the 'ancient text' of the Bamboo Annals, gathered from quotations in older books), Chinese Wikisource