This Day in History - April 10, 1815 - the most powerful volcanic eruption occurs on Mount Tambora in Indonesia. So much volcanic ash was ejected that the world climate was so affected that 1816 was known as the "year without a summer." Thomas Jefferson even noted that the summer was "as cold as a moderate winter" without having understood the connection to the eruption at that time.
While not making the connection to Mount Tambora's eruption in 1815, Jefferson noted its effects on Virginia weather in 1816, noting that summer was "as…