It's definitely more comfy to have a quilt-in-progress draped over you in the winter as opposed to in the summer, but I'm a year-round quilter too. I just moved my quilting room downstairs - it was in the hottest corner of the house but now it's downstairs in a room that gets lots of shade so I think next summer will be a much better quilting summer.
I AM very much looking forward to some rain, though! My new sewing room has a large window that faces the street, I can't wait to be inside quilting and watching the rain. (My old quilt room window just faced the wall of the neighbor's house. Bor-ring!)