We timed Derek Jeter in high school at 92 mph across the infield. The typical throw across the infield is in the low 80s, but there are plays that require much better than that. Ozzie Smith was an 80 mph or even less guy across the infield. Jeter has a hose!
82 is pretty good if it is in the flow. There are lots of high school kids who throw mid 80s or better in the flow. There are also some who throw 90 or better but some of them are just throwing for the gun and it shows.
You might want to check the velocity across the infield from this event. Obviously there's more than velocity that goes into grading an arm.
Here is a link from the National, it should give an idea of the arm strength of some of the top guys in high school baseball. All infielders field and throw from the shortstop position. You'll have to click on the players names.
PG National 2007 Cincinnati