How is foreshadowing used in the novel frankenstein?

Well, in ch. 18 Clerval describes Victor as ""alive to every new scene, joyful when he saw the beauties of the setting sun, and more happy when he beheld it rise and recommence a new day." There is so much irony in the novel that we just know it is all gloom for the rest of the story.

On the night of his creation, it is dark and dreary; later comes a "tempest." This suggests bad things to come.

When ever Victor suggests anything positive, something bad happens.