Why 536 was ‘the worst year to be alive’
sciencemag.org
sciencemag.org
https://www.thoughtco.com/dust-veil-environmental-disaster-i...
The wikipedia article also has some additional sources and information:
https://en.wikipedia.org/wiki/Extreme_weather_events_of_535%...
The reference sections at the bottom of each of those pages are full with further sources that may help answer your question.
As an aside, OP's comment was voted dead. For asking an on-topic question. Seriously HN?
https://wondery.com/shows/tides-of-history/
It particularly focuses on the experiences of the average person in Italy, which not only suffered plague and failing crops, but was being torn apart during a long period of warfare between the Romans and the Goths.
Rome itself was largely abandoned in this period, leaving a very small population, the aqueducts were destroyed during sieges, and the poor farmers were frequently victimized by the armies passing through, stealing their already meager food supply and spreading disease. It was a terribly time to be alive.