Groundhog Day

The groundhog is like most other prophets; it delivers its prediction and then disappears. – Bill Vaughn

To shorten winter, borrow some money due in spring. – W.J. Vogel

One Swallow maketh not Summer; nor one Woodcock a Winter. – William Camden, Remains, 1605

In European folk-lore, the bear is the Candlemas weather-prophet. – John Russell Bartlett, Dictionary of Americanisms: A Glossary of Words and Phras

One fair day in winter makes not birds merry. – George Herbert, c.1640

Every mile is two in winter. – George Herbert