Caused by the 1815 Eruption of Mount Tambora in Indonesia

Because the explosion of Mount Tambora was very intense, the ash
cloud reached the earth’s stratosphere which enabled it to be carried to
other parts of the world. Because it takes time for the ash to
circulate, it didn’t drastically affect weather patterns in distant
places, such as the Northern Hemisphere, until 1816. The dust in the
atmosphere caused less sunlight to pass through, thus causing
unseasonably cold temperatures.

There were two other volcanoes that erupted in previous years, La
Soufriere in Saint Vincent (1812) and Mayon in the Philippines (1814).
Although these volcanoes were not as intense, there was existing dust in
the atmosphere and Mount Tambora’s ash made it much worse.

In addition to volcanic activity, the sun was going through a period
of low magnetic activity called the Dalton Minimum. Low magnetic
activity reduces the number of bright spots on the sun making the sun
slightly dimmer. When this occurs, the world experiences cooler
temperatures.

The Summer of 1816 Around the World

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