Continuing our story from Sunday’s column, the famous “Year Without a Summer” occurred in 1816, the result of the eruption of Mount Tambora. The volcano discharged dust and sulfurous gases that spread around the globe. The diary of Hiram Harwood, of Bennington, Vt., noted on June 11, 1817, frigid temperatures found New Englanders building “roaring fires in their hearth, as killing frosts turned leaves and gardens black.” Once the cold spell ended, farmers replanted their crops only to have temperatures plummet again in July. On Aug. 21, 1817, hard frosts killed crops in Boston and a snowstorm whitened the peaks of the Green Mountains. The eruption inflicted climatic changes all over the Northern Hemisphere and is one of the first examples of global cooling.