Year Without a Summer

The unusually cold summer of 1816, marked by crop failures and abnormal weather across parts of the Northern Hemisphere. Its main cause was atmospheric cooling after Mount Tambora’s 1815 eruption.

Mount Tambora: An Indonesian volcano whose massive 1815 eruption was among the largest in recorded history. Its eruption injected sunlight-reflecting material into the atmosphere, driving much of the 1816 cooling.
1816 New England weather: A sequence of frosts, snow, and unusually low temperatures in New England during the summer of 1816. It shows how sharply the global disturbance affected a particular region.
Mount Pinatubo: A Philippine volcano whose 1991 eruption caused measurable global cooling through stratospheric aerosols. Its modern observations clarify the aerosol-driven cooling mechanism that was inferred for Tambora.
Mary Shelley: An English novelist best known for writing Frankenstein, first published in 1818. Shelley later recalled the gloomy weather of 1816 as part of the setting for Frankenstein’s conception.
Climate attribution: The process of estimating how much specific causes contributed to observed climate changes. Researchers separate Tambora’s influence from natural variability and other eruptions.
Volcanic winter: A period of climatic cooling caused by volcanic emissions that reduce the sunlight reaching Earth’s surface. The cold summer was a regional expression of this global cooling mechanism.
1816 European weather: Unusually cold and wet conditions across parts of Europe during the summer of 1816. Persistent rain and low temperatures damaged crops across several European regions.
Laki: An Icelandic volcanic fissure that erupted from 1783 to 1784, releasing vast quantities of gas and ash. Its earlier atmospheric and social effects offer a comparison with Tambora’s climatic aftermath.
Frankenstein: Mary Shelley’s 1818 novel about Victor Frankenstein and the living being he creates. The novel’s origin is linked to the rainy summer Shelley spent near Lake Geneva in 1816.
Tree-ring climate reconstruction: The use of annual tree growth patterns to infer past environmental conditions, including temperature and moisture. Tree rings help test how severe and widespread the 1816 cooling was.

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