I'm new to the site, but glad to find someone else with the same window problem. Misery loves company
I had 6 windows replaced on my home, and when the wind is blow across that side of the house (shearing across the back), we hear reasonably loud whistling noises or "hooting" noises. There is no rattling and no wind infiltration through the new windows. I have tried removing the screens (no change), adding caulk where small gaps existed around the windows (no change), and taping narrow edges in the siding near the windows (no change).
It seems like the sound is caused by the shape of the aluminum wrap around the (old) wood frame sections, or maybe the shape of the new window frames. I haven't solved it yet, but I have a long list of things that didn't work.
If anyone has any other suggestions, please feel free to post. I figured I'd at least confirm that the original poster is not alone.