I pointed out previously that cats like to hang out in open windows (even in winter).
It turns out this has limits. With the Blizzard of 2005 in full swing, I opened a window for moment to see the reminds of our yard better. Billy, on the floor, got a mere hint of the cold draft and immediately wandered off. That was just as well, had he hopped up to the sill I was still closing the window.