Tambora

Tambora was a volcano which erupted in 1815.

This eruption caused an accumulation of volcanic ash in the upper atmosphere. The effect was so significant that even in June of next year the half delirious Eighth Doctor could still guess which year it was by observing the atmosphere on the shores of Lake Geneva. (AUDIO: Mary's Story)

Behind the Scenes
The on 10 April 1815 in Indonesia was one of the most powerful recorded volcanic eruptions. It affected the weather all over the world so much that 1816 was described as a "". The bad weather was largely the reason why Mary Shelley, Lord Byron and their friends spent so much time indoors in Villa Diodati around the time of the Doctor's arrival. Mary Shelley wrote about the horrible weather in the introduction to the 1831 edition of Frankenstein.