The Portland Rain Conspiracy

For years I've been boasting to out-of-towners, "Portland seems damp, but we only get 37 inches of annual precipitation on average, which is less than most East Coast and Southern cities." For example, Philadelphia gets 42 inches, and most of Florida gets more than 50 inches. In Portland, the rain (and rare snow) is simply spread out over more days. This has been my story. But after a recent conversation and some digital digging, I am concerned that our rain data is suspect - or, at the very least, not representative of the Portland region, or even the city proper.