Year Without a Summer
Event
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The year 1816 AD is known as the Year Without a Summer because of severe climate abnormalities that caused average global temperatures to decrease by 0.4–0.7 °C. Summer temperatures in Europe were the ... Wikipedia
Start date: April 10, 1815
Impact: Caused a volcanic winter that dropped temperatures by 0.4–0.7°C (or 0.7–1°F) worldwide
Volcano: Mount Tambora