McGonagall rarely goes outside, but today I managed to catch her and bring her out to the balcony where I placed her on the piece of cat furniture that Joe and I built.  She was a good cat and stayed on top of the furniture.  All of the other cats want to go out on the roof when I bring them out to the balcony.  Tiger figured out that I had the balcony door open and let himself into my office while McGonagall was out there.  I had to shoo him out and then lock the door.