The 1.78" of rain in ten days in 2008 was distinctly more than in the same time period during the years since then. However, the onset of rainy weather in the fall can vary quite a bit from year to year. Follow this link to see a state map with average annual rainfall. What is the average annual rainfall for Portland? for Tillamook Bay? for Bend? This other link will take you to a state map showing county boundaries and cities which might help you figure out where Portland, Tillamook Bay, and Bend are on the rainfall map. Enjoy the hunt!