Havamal

At night is joyful he who is sure of travelling enjoyment. (A ship’s yards are short.) Variable is an autumn night. Many are the weather’s changes in five days, but more in a month.

Nótt verðr feginn sá er nesti trúir skammar ro skips rár hverf er haustgríma fjölð um viðrir á fimm dögum en meira á mánuði

Havamal: 74, Gestaþáttr