My kids all had in the 4.4 to 4.6 range. GPA's in excess of 4.25 were pretty common.
That said, UGA does draw good students. It has the distinction of being a flagship state school in a state that will give you an 80% tuition scholarship just for maintaining a "B" average in high school. When you have a crazy low tuition in a flagship school, you will attract a very bright cross section of students.
I know of a kid with over a 4.1, weighted at almost a 5.4