The figure above shows the average undergraduate GPAs for American colleges and universities from 1991-2006 based on data from: Alabama, Appalachian State, Auburn, Brown, Bucknell, Carleton, Central Florida, Central Michigan, Centre, Colorado, Colorado State, Columbia, Cornell, CSU-Fullerton, CSU-Sacramento, CSU-San Bernardino, Dartmouth, Duke, Elon, Florida, Furman, Georgia Tech, Georgetown, Georgia, Hampden-Sydney, Harvard, Harvey Mudd, Hope, Houston, Indiana, Kansas, Kent State, Kenyon, Knox, Messiah, Michigan, Middlebury, Nebraska-Kearney, North Carolina State, North Carolina-Asheville, North Carolina-Chapel Hill, North Carolina-Greensboro, Northern Iowa, Northern Michigan, Ohio State, Penn State, Pomona, Princeton, Purdue, Roanoke, Rutgers, Southern Illinois, Texas, Texas A&M, Texas State, UC-Berkeley, UC-Irvine, UCLA, UC-Santa Barbara, Utah, UW-Oshkosh, Virginia, Washington State, Washington-Seattle, Western Washington, Wheaton (IL), William & Mary, Winthrop, Wisconsin-La Crosse, and Wisconsin-Madison. Note that inclusion in the average does not imply that an institution has significant inflation. Data on the GPAs for each institution can be found at the bottom of this web page. Institutions comprising this average were chosen strictly because they have either published their data or have sent their data to the author on GPA trends over the last 11-16 years.
Mark Perry has more.