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Tambora volcano eruption in Indonesia, which clouded sunlight around the world for more than a year.

The unusually cold year of 1816, which went down in history as the Year Without a Summer, stemmed from an eruption of the Tambora volcano in Indonesia in April of 1815, possibly exacerbated by a hitherto unknown volcanic eruption six years before.

Moussallam cited global cooling periods that occurred after the eruption of Tambora in 1815 and Mt.

Tambora erupted in present-day Indonesia.

In 1815, Mount Tambora in what’s now Indonesia unleashed the largest known volcanic eruption in history.