1816 is famous for being the year without summer. A volcano in the Dutch East Indies spread so much ash into the atmosphere that crops failed across the world. New England was particularly hard hit with frosts in each month of the summer and snow in August. A 1817 almanac in our collections reflected on 1816 philosophically: "Frost destroys the seeds of disease'--Perhaps if the frost had not prevented, a destructive pestilence might have depopulated North America."
To see the diary ask for Codex MS 000585, Leavitt's Farmer's Amanac is at NH Imprints Gilmanton 1804 (ask for the 1815-1829 volume).