Winter swimming in Houhai is a cold weather pastime for a (very) small group of Beijing men. I cannot recall what prevented this small area of open water along the north side of the lake from freezing over. But there was more than enough room for a dip and the winter swimmers wasted no time taking advantage of it. I do recall this was a very cold Beijing Christmas day with temperatures below 0°/32°. My hands were freezing holding the camera.