I took a shot this past summer almost identical to that of the same kind of spider that was hanging around in my shed for quite a while. As you already know these spiders hang on their webs upside down and my spider as it seems yours is was in front of a window. I had to shoot mine through a dirty window as I never clean the one in my lawn equipment shed. I was going to post the image here but I don't want to hijack your thread. Think this is an orb weaver.