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Why was 1816 called the year without a summer?

The year 1816 was called the “year without a summer” because cold weather reached areas far from Mount Tambora after its 1815 eruption. Parts of western Europe and eastern North America experienced heavy snow and killing frost even in June, July, and August. These cold events caused crop failures and starvation in those regions. On Sumbawa and nearby islands, crops also could not grow, and about 80,000 people died from disease and famine.