[math-fun] Let it snow

What do you all make of the precipitation forecast at http://forecast.io for the Boston area? Does "0.2 in/hr" mean one-fifth of an inch per hour? It seems to me, given the severity of the current blizzard, they must mean something closer to two inches per hour. I made an attempt at visually integrating the curve they show, and it yielded a total snowfall of 3 inches for the coming week. That can't be what they mean. Did I mis-integrate? Or have they mis-labeled their vertical axis? Jim Propp