1816: The Year Without a Summer - The Second Coldest in Six Centuries

Based on climate records, 1816 earned the nickname 'year without a summer' as it was the second coldest year in the northern hemisphere over the past six centuries. This unusually cold year was caused by the eruption of Mount Tambora in Indonesia, which released massive amounts of ash and sulfur dioxide into the atmosphere. These particles blocked sunlight, causing a significant drop in global temperatures.