Can you clarify your question? Particularly, why Victorian England? Frankenstein was published in 1818 originally (the first edition, anyway, often considered the more cheerful version), and in 1831 for its final revised edition (the depressing one). That makes Shelley's novel a predecessor of the Victorian period. Are you referring to a particular revival of interest in Shelley's novel? Or did you mean when it was published?

EDIT: dates are hard to math.