1816 is known as the year without summer, with snow falling in June and frost in July. What happened?

In May 1816, there was a frost in the northeastern United States, and many crops were frozen to death.

June is the hot season of summer. Canada and the United States have experienced heavy snowfall twice, with the snow reaching more than a foot thick in some areas.

From July to August, the river water as far south as Pennsylvania is still frozen. In some places, the normal summer temperature reaches more than 30 degrees. However, within just a few hours, the temperature actually drops to close to 0 degrees. Germany also experienced frost in August.

According to statistics, this abnormal seasonal change occurred in 1816, and about 200,000 people died in Europe due to seasonal abnormalities. This was a very terrible dark year in human history, also known as the "Year Without Summer". During this year, China, which was far away from Europe, was still in the Jiaqing period of the Qing Dynasty. In Zhejiang, China, from January to November, there are almost no sunny days in these ten months. The reason for this abnormal season dates back to 1815.

Snow falling in June and frost in July are related to volcanic eruptions

In the southern hemisphere of the earth, Indonesia. In April 1815, Mount Tambora on the Indonesian island of Sumbawa erupted. This volcanic eruption was the largest volcanic eruption in human history. The Tambora eruption had a great impact on the earth and completely changed the history of mankind. More than 92,000 people died due to this volcanic eruption.

The eruption power index of Tambora volcano reached level seven. The volcano erupted and ejected a volume of volcanic ash of more than 150 cubic kilometers. The altitude actually reaches the stratosphere of 44 kilometers. Even as far away as London, England, you can see colorful sunsets caused by volcanic ash.

The sulfur dioxide erupted into the high altitude by Tambora volcano caused the global temperature to drop by about 0.4 to 0.7 degrees in one or two years.

This year, a large number of Europeans migrated

Due to the environmental impact of the Year without Summer, there were a large number of Europeans who may have felt that their local area was an unknown place. A large-scale migration has begun. Many people immigrated to the United States, including 100,000 British people. About 20,000 Germans also immigrated to the United States. Some areas in the United States also experienced severe cold snaps due to abnormal weather changes. Many Americans also began to move from the West to the East. Eventually the international city of New York was formed. From 1792 to 1812, it took 20 years for the United States to establish four new states. However, from 1816 to 1821, in just five years, six new states were established in the United States. It was this disaster that caused the population of the United States to explode.

The distant Qing Dynasty also had a great impact

In the year 1816, the 21st year of Jiaqing in the Qing Dynasty, Jiaqing was almost an empty shell of the country because his father Qianlong left it behind. Many officials in the imperial court were corrupt. Jiaqing also wanted to run the Qing Dynasty well, but he was unable to do so. Coupled with the natural disaster in 1816, Zhejiang had not seen sunny weather for almost a year, while Yunnan suffered from a large number of famines due to the impact of this environmental change. Snow also occurs in Anhui and Jiangxi in July and August. This strange and abnormal change in weather accelerated the decline of the Qing Dynasty, which had already begun to decline.