He is average height and average weight

[ROBINDESBOIS]

I know that to say to be average height is Ok, but never heard average weight is that OK too?

[Awaken]

Yes. "He is average height and weight." is a perfectly normal statement.

[Glen]

Should it be "He is of average height and weight"? Is the "of" necessary here?

[Rusty]

You are of the right opinion.

One doesn't say 'he is height and weight', and adding an adjective doesn't change matters.

[Awaken]

Haha. Yeah. What they said!