The Little Ice Age — Climate and Crisis in the Early Modern World
A centuries-long period of regional cooling, strongest in the North Atlantic world, that advanced glaciers, ruined harvests, and intersected with famines, wars, and migrations from the fourteenth to the nineteenth century — and gave modern climate science one of its most studied cases.
Events
The Great Famine Opens the Era of Climatic Deterioration
Three consecutive years of cold, relentless rain from 1315 to 1317 destroyed harvests across northern Europe, producing the worst famine of the medieval period, with millions of deaths and reports of epidemic disease and social breakdown. Many climate historians treat the wet, cold turn as the opening of the long climatic deterioration that preceded the classic Little Ice Age.
Location: Northern Europe
The Spörer Minimum Coincides with Deepening Cold
Between about 1460 and 1550, records of sunspots (scarce to begin with) and cosmogenic isotopes indicate unusually low solar activity — the Spörer Minimum — coinciding with some of the era's coldest decades. Solar lows would recur in the Maunder Minimum of 1645–1715, one of several proposed drivers alongside volcanic eruptions and ocean circulation shifts.
Location: Northern Hemisphere
Alpine Glaciers Advance on Villages and Farms
During the seventeenth century, glaciers in the Alps reached their greatest extents in millennia, overrunning high pastures, orchards, and in places entire villages; the lower Grindelwald glacier and others repeatedly dammed meltwater lakes that burst destructively. Villages prayed and processed against the ice, and chroniclers recorded the loss of taxable land. The advance peaked around 1640–1700 in many valleys.
Location: The Alps, Europe
The Maunder Minimum Marks the Coldest Decades
From 1645 to 1715, near-total absence of sunspots — the Maunder Minimum, named after astronomer E. Walter Maunder — coincided with the coldest stretch of the Little Ice Age, including the famously frozen Thames frost fairs in London. The correlation between solar lows and cold decades remains one of the era's most debated pieces of evidence, since solar output changes alone appear too small to explain the full signal.
Location: Northern Hemisphere
Cold and Volcanic Winters Drive the 1690s Famines
The 1690s ranked among the coldest decades of the millennium in western Europe; in 1693–1694, frost-ruined harvests and war taxation produced a famine that killed roughly 1.3 million people in France, with parallel mortality in Scotland, Scandinavia, and elsewhere. Finland lost about a third of its population to the famine of 1695–1697. Historians treat climate as one contributing factor alongside political and economic conditions.
Location: France and Northern Europe
The Laki Eruption Freezes the North
The Laki fissure eruption in Iceland emitted enormous volumes of sulfur dioxide over eight months. The following winter was among the coldest on record in the North Atlantic region; Iceland lost roughly a quarter of its population to famine and fluorine poisoning, and unusual dry fogs were reported across Europe. Benjamin Franklin, then in Paris, speculated in 1784 that a volcanic haze could weaken sunlight — an early suggestion of the volcanic-cooling mechanism.
Location: Iceland
The Year Without a Summer
The 1815 eruption of Mount Tambora in Indonesia, the largest in over a millennium, injected sulfate aerosols into the stratosphere. In 1816, June snows fell in New England, crop failures spread across the Northern Hemisphere, food riots broke out in Europe, and migration out of New England and famine-driven emigration from Europe accelerated. It was the last great volcanic winter of the Little Ice Age era.
Location: Northern Hemisphere
The Term "Little Ice Age" Enters Science
Geologist François E. Matthes introduced the term "Little Ice Age" in a 1939 report on glacier fluctuations, applying it to the period of renewed glaciation after the warmer Middle Ages. Climate historians including Hubert Lamb later mapped the era from documentary and proxy records, establishing the conventional span of roughly the sixteenth to nineteenth centuries, with some extending it from about 1300 to 1850.
Location: United States
Modern Science Reassesses the Little Ice Age
The IPCC's Third Assessment Report and subsequent reconstruction studies concluded that the cooling was regionally pronounced — strongest around the North Atlantic — but modest and asynchronous at the hemispheric scale, rather than a globally uniform ice age. Debate continues over the relative roles of solar variability, volcanic forcing, ocean circulation, and land-use change. The era remains the principal historical laboratory for studying how societies absorb sustained climate stress.
Location: International