Every February 2nd, people across Pennsylvania and the world look to a famous rodent to answer the question—when will spring come?

For over 120 years, Punxsutawney Phil Soweby ("Punxsutawney Phil" for short), has offered his predictions, based on whether he sees his shadow (indicating more winter) or not (indicating an early spring).

The first official Groundhog Day celebration took place in 1887, and Phil has gone on to star in a blockbuster film, dominate the early February news cycle, and even appear on Oprah.  (He also has his own Beanie Baby and his own flower.)

In addition to weather predictions, Phil also loves data, and while people think he is hibernating, he is actually conducting demographic analysis.  As a Social Explorer subscriber, he used the site's mapping and reporting tools to look at the composition of his hometown.

Punxsutawney, PA, located outside of Pittsburgh, is part of Jefferson County.  Examining Census data from 1890, Phil learned that the population was 44,405 around the time of his first predictions.  While the rest of the nation was becoming more urban, Jefferson County remained more rural with only one eighth of the population living in places with 2,500 people or more (compared to nearly half statewide and more than a third in the US).

Many Jefferson residents worked in the farming industry.  Back then, there were 3.2 families for every farm in Jefferson County–higher than the rest of the state with 5.0 families per farm. Less than three decades after the Civil War, the county (located in a northern state) was 99.9 percent white, which was a little higher than statewide (97.9 percent) and also higher than nationwide (87.8 percent).  (The Census also noted that there was one Chinese resident of Jefferson County in 1890.)

Groundhog Day was originally called Candlemas, a day that Germans said the hibernating groundhog took a break from slumbering to check the weather.  (According to the Oxford Companion to the Year.)  If the creature sees its shadow and gets scared, winter will hold on and hibernating will continue.  Or, if the groundhog doesn't get scared, he will stay awake and kick off an early spring. 

Back in 1890, there were 703 Germans living in Jefferson County (representing 1.6 percent of the county population and 11.3 percent of the foreign born), making Germany the fourth most common foreign born place of birth behind England, Scotland, and Austria. 

Groundhog Day is also said to be Celtic in its roots, so perhaps the 623 Irish residents (representing 1.4 percent of the county population and 10.1 percent of the foreign born) helped to establish the tradition in Pennsylvania.  

Looking to today’s numbers, Phil was astonished to learn from the 2010 Census that Jefferson County has just 795 more people than it did 120 years ago.  While Jefferson grew by just 1.8 percent, the state grew by 141.6 percent and the nation grew by 393.0 percent.