The mysterious weather and climate anomalies of the Year Without Summer did not end with the coming of fall or the end of the calendar year 1816. The Tambora effect—the chilling of the world’s climate by volcanic dust from the 1815 mega-eruption—lingered long after that. The failure of summer crops in many parts of America, Europe and the world meant a lean and hungry winter for millions of people. And for many of them, the brutally cold winter of 1816-17 was much colder and more harrowing than any they had ever lived through before, or would again.

In this episode, the final in this minseries, you’ll shiver along with missionaries and Indians on the frontier; you’ll learn about some of the bizarre theories that people advanced for what was causing the events, such as an “electrical fluid” around the Earth supposedly linked to earthquakes; and you’ll meet a very eccentric Scotsman whose obsession with weather, sparked by the 1816 anomalies, utterly consumed his life for the next half century. This episode contains threads that connect to various other SD installments, including Episode 6 (Jefferson in Winter), 7 (Volcano), 24 (New England’s Cold Friday), and 25 (The Man in the Buffalo Fur Suit).

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