Fimbulwinter is three successive winters, when snow comes in from all directions, without any intervening summer.
In the poem Vafþrúðnismál, Odin poses the question to Vafþrúðnir as to who of mankind will survive the Fimbulwinter.
Vafþrúðnir responds that Líf and Lífþrasir will survive and that they will live in the forest of Hoddmímis holt.
The mythology might be related to the volcanic winter of 536, which resulted in a notable drop in temperature across northern Europe.
[2][3] In Denmark, Norway, Sweden, and other Nordic countries, the term Fimbulvetr has been borrowed from Old Norse to refer to an unusually cold and harsh winter.