Since 1886, Punxsutawney Phil has seen his shadow 98 times, which according to legend is a predicton of six more weeks of winter weather. It has been documented that Phil has not seen his shadow only 15 times since Groundhog Day was first recognized in Punxsutawney, Pennsylvania 124 years ago (most recently in 2007).
There has been a total of 10 years during this long standing tradition where no record was kept on whether Phil did, or did not see his shadow on February 2 of each year (1886, 1889, 1891 - 1897, 1899). But as the Punxsutawney Groundhog Club would say - every documented prediction of continued winter weather based off of Phil seeing his shadow has been 100% accurate.
No bias there I'm sure . . .
Reference: http://www.groundhog.org/
