It seems from what I have seen online that several Aveo owners like me have had a wind howl seemingly from the upper corners of the windshield. In South Dakota we have wind and for awhile I was getting that howl every day I drove to work. It was horrible. I tried the weatherstrip fix the dealer gave me and it didn't help. I also added some more weather-stripping by advice of a forum and that didn't help.
Then in an separate effort to save the paint on my car...(cause I have to do 2 miles of gravel each day) I installed custom splash-guards behind the tires. The noise is gone.