1816 was the year without a summer. It was the trough of the Dalton Minimum (not even a grand solar minimum) and was exacerbated by the massive eruption of Mt. Tambora in Indonesia in 1815, which darkened the globe. Violent eruptions tend to coincide with solar minimums.
https://www.americanthinker.com/articles/2021/06/preparing_for_the_coming_food_shortages_associated_with_the_dark_cold_years.html