Is Groundhog Day Accurate? Punxsutawney Phil's Real Record

How Groundhog Day works

Every February 2, members of the Punxsutawney Groundhog Club, dressed in top hats and tuxedos, gather before dawn at Gobbler’s Knob, a hill just outside Punxsutawney, Pennsylvania. A groundhog named Phil is lifted out of an artificial burrow in front of a crowd that can number in the tens of thousands.

According to the tradition:

• If Phil sees his shadow, he retreats to his burrow and there will be six more weeks of winter.
• If he does not see his shadow, there will be an early spring.

The club’s president claims to understand “Groundhogese” and announces the forecast from a prepared scroll. The whole event is lighthearted theater, and the club says any wrong forecast is the fault of the translator, not of Phil.

What is Punxsutawney Phil’s real track record?

Phil’s forecasts have been checked many times against actual weather, and the results are consistent: he is unreliable.

NOAA’s scientists used a simple test. If Phil predicted an early spring, they checked whether February and March temperatures across the United States were above normal. If he predicted more winter, they checked for below-normal temperatures. Phil was right in only about four years out of ten.

A wider study by climate researchers at Lakehead University in Ontario, Canada, compared about 530 forecasts made by 33 different groundhogs with the local date when spring wildflowers began to bloom. Overall, the groundhogs were right about half the time, the same result as flipping a coin.

Phil also has a strong bias. Of the forecasts recorded since the 1880s, he has seen his shadow and called for more winter more than 100 times, and predicted an early spring only around 20 times. In 2026 he again saw his shadow.

Why a groundhog cannot predict spring

There are several reasons why the forecast cannot work:

• One place, one moment. Whether there is a shadow depends on whether the sun is out at one hilltop at one moment on one morning. Weather over the next six weeks across a whole continent depends on large-scale patterns, such as the jet stream and ocean temperatures.
• The groundhog has no say. Phil does not choose whether to stay out or retreat. The handlers decide, and the forecast is agreed in advance.
• Six weeks of winter happens anyway. February 2 falls about six and a half weeks before the spring equinox on March 20 or 21. By the calendar, there are always roughly six more weeks of winter.

In nature, groundhogs do not come out on February 2 to check the weather. In much of their range they are still deep in hibernation. Males do sometimes wake early in February to visit females’ burrows, as explained in Do groundhogs hibernate?, but this has nothing to do with forecasting.

Where did Groundhog Day come from?

The roots of the custom go back to Candlemas, a Christian feast on February 2, about halfway between the winter solstice and the spring equinox. In much of Europe, people believed that fine weather on Candlemas meant winter would return. A traditional English rhyme says: “If Candlemas Day be fair and bright, winter will have another flight.”

In German-speaking lands, this belief became attached to hibernating animals. The forecaster was usually the badger, and in some regions the bear or fox. If the badger came out on Candlemas and saw its shadow, it went back to its den for another four weeks. In Ireland, similar stories were told on St. Brigid’s Day, February 1, about the European hedgehog.

German immigrants who settled in Pennsylvania, the Pennsylvania Dutch, brought the custom with them. There were no European badgers in Pennsylvania, so the common local groundhog took its place, and the four weeks became six. The earliest known written mention of Groundhog Day in America is a diary entry from Morgantown, Pennsylvania, dated February 2, 1840.

How Punxsutawney became famous

In 1886 the local newspaper, the Punxsutawney Spirit, reported on the groundhog’s forecast. Its editor, Clymer Freas, is usually credited with creating the event, and the first official trip to Gobbler’s Knob followed in 1887. The groundhog was not named Phil until 1961.

For a century the event drew small crowds. The 1993 comedy film Groundhog Day, starring Bill Murray, changed that, and crowds grew from around 2,000 to many thousands each year. Today the ceremony is streamed online and followed around the world.

Other weather-predicting animals

Phil has many rivals. Canada has Wiarton Willie in Ontario and Shubenacadie Sam in Nova Scotia, while the United States has Staten Island Chuck in New York City and General Beauregard Lee in Georgia, among many others. Some towns now use stuffed toy groundhogs or costumed mascots instead of live animals.

Other animals feature in weather lore too, such as swallows flying low before rain, discussed in Do swallows fly low before rain?. Some of these sayings contain a grain of truth. The groundhog’s shadow is not one of them, but as a midwinter celebration it remains one of North America’s best-loved traditions.