In June 1816, snow fell in parts of New England and upstate New York. Farmers in Vermont watched frost kill their newly planted crops, then replanted and lost them again. Across the Atlantic, rain fell almost without pause over much of western Europe, rivers flooded, and grain rotted in the fields. People at the time had no clear explanation. Some blamed sunspots, others divine punishment. New Englanders gave the year a grim nickname: “Eighteen Hundred and Froze to Death.” Today 1816 is known as the Year Without a Summer. Most scientists trace its unusual cold to a volcanic eruption on the other side of the world a year earlier.
The Eruption of Mount Tambora
In April 1815, Mount Tambora on the island of Sumbawa, in what is now Indonesia, erupted with enormous force. The main eruption peaked on April 10–11, and explosions were reportedly heard more than a thousand miles away. It is considered the largest volcanic eruption in recorded history. The mountain lost about a third of its height, and a huge crater was left where the summit had been.
The local toll was devastating. Pyroclastic flows and ashfall destroyed villages, and tens of thousands of people on Sumbawa and nearby islands died, either directly or from the famine and disease that followed when crops and livestock were destroyed. Estimates vary widely, but many historians put the regional death toll at 70,000 or more.
How a Volcano Cools a Planet
Tambora’s global effects came from what it sent high into the atmosphere. Along with ash, the eruption injected large amounts of sulfur dioxide into the stratosphere, where it formed a veil of tiny sulfate aerosol droplets. These droplets reflected some incoming sunlight back into space. Because the stratosphere has no rain to wash them out, the aerosols lingered for many months and spread around the globe.
The result was a drop in average temperatures across much of the Northern Hemisphere, generally estimated at around 0.4 to 0.7°C globally, with much larger swings in some regions and seasons. That may sound small, but it was enough to disrupt weather patterns and shorten growing seasons. Colorful sunsets, caused by aerosols scattering light, were recorded in Europe. Some art historians have suggested they can be seen in paintings of the period, including works by J. M. W. Turner, though that link is debated.
Snow in June: North America
In the northeastern United States and eastern Canada, the summer of 1816 brought a series of severe cold snaps. According to the National Park Service, frost killed most crops in parts of New York, Massachusetts, New Hampshire and Vermont in May. In early June, snow fell in places including Albany, New York, and Dennysville, Maine. Lakes and rivers in northwestern Pennsylvania still had ice in July, and frost reached as far south as Virginia in late August.
The weather swung wildly. Warm days could be followed within hours by near-freezing temperatures. Corn, which needs a long warm season, was hit especially hard. Hay crops failed, so farmers struggled to feed their animals through the next winter. Prices for grain rose sharply.
The hardship pushed many New England families to move west. Historians have linked the difficult years around 1816 to increased migration from Vermont and other northeastern states toward the Ohio Valley and beyond, though the cold was one factor among several, including the opening of new lands and economic changes after the War of 1812. Among the families who moved was that of a young Joseph Smith, who relocated from Vermont to western New York around this time, a move that later shaped the early history of the Latter Day Saint movement.
Hunger in Europe
In Europe the problem was less frost than relentless cold rain. Western and central Europe experienced one of the wettest, coldest summers on record. Harvests failed in Britain, Ireland, France, the German states and Switzerland. Food prices spiked, and in many places food riots broke out. Switzerland was among the worst affected, with reports of severe hunger in 1816 and 1817. In Ireland, prolonged rain contributed to crop failures and a typhus epidemic.
Some historians stress that the crisis did not come from the weather alone. Europe was just emerging from more than two decades of the Revolutionary and Napoleonic Wars, which had ended in 1815. Economies were exhausted, demobilized soldiers were looking for work, and governments were burdened with debt. The cold summer struck an already weakened continent, turning a bad harvest into a wider subsistence crisis. Scholars continue to debate how much of the suffering of 1816–1817 should be attributed to Tambora and how much to these existing conditions.
The crisis also drove migration. Thousands of people from the German states and Switzerland left for the United States or for Russia in search of better prospects, adding to emigration flows that would grow through the nineteenth century.
Frankenstein and a Gloomy Swiss Summer
One of the most famous consequences of the Year Without a Summer was literary. In June 1816, the poet Lord Byron rented the Villa Diodati on the shores of Lake Geneva. Nearby stayed the poet Percy Bysshe Shelley, eighteen-year-old Mary Godwin (soon to be Mary Shelley), and her stepsister Claire Clairmont. Byron’s physician, John Polidori, was also present.
Storms and persistent rain kept the group indoors for days at a time. To pass the time, Byron proposed that each of them write a ghost story. Mary Shelley began the tale that became Frankenstein; or, The Modern Prometheus, published in 1818. Polidori wrote The Vampyre, an early and influential vampire story. Byron’s own poem “Darkness,” written that summer, imagines a world where the sun has gone out, and many readers have seen in it the gloom of 1816. The weather did not create these works, but it provided the setting in which they were written.
Other Possible Echoes
Historians and scientists have proposed a range of other effects. Some have linked the high price of oats and the loss of horses to the experiments of the German inventor Karl Drais, whose 1817 “running machine” was an early ancestor of the bicycle, though this connection is speculative. In Asia, unusual weather has been associated with crop failures in parts of China. Researchers have also studied whether the climate disruption played a role in the spread of cholera from the Bay of Bengal in 1817, the start of the first global cholera pandemic. That link remains a subject of research rather than established fact.
Why 1816 Still Matters
The Year Without a Summer has become an important case study for scientists. It shows how a single large eruption can affect global climate for a year or more, and how vulnerable food systems are to sudden shifts in weather. Climate researchers use records from 1816, including ship logs, diaries, harvest records and tree rings, to test models of volcanic cooling. Emergency planners point out that an eruption of similar size could happen again, and that today’s global food supply chains, while more resilient in some ways, could still be badly disrupted.
For the people who lived through it, 1816 was a year of hunger, worry and hard decisions about whether to stay or leave. Their experience shows how closely ordinary life was tied to the weather, and how an event on a distant island could reach farms in Vermont, villages in Switzerland and a rented villa on Lake Geneva.
Sources
- National Park Service: 1816, The Year Without Summer
- Britannica: Mount Tambora
- Phys.org / The Conversation: Did a volcanic eruption in Indonesia really lead to the creation of Frankenstein?
Featured image: This image was taken by the NASA Expedition 20 crew. / Wikimedia Commons, Public domain
