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Oregon rainfall varies widely from region to region. Precipitation in the state varies widely: some western coastal slopes approach 200 inches (5,100 mm) annually, while the driest places, such as the Alvord Desert (in the rain shadow of Steens Mountain) in eastern Oregon, get as little as 5 inches (130 mm). [2] [3]
Oregon's geographical center is further west than any of the other 48 contiguous ... Climate data for Portland ... Average precipitation days (≥ 0.01 in) 18.6 15.5
Rainfall amounts can range from an average of 66.40 inches (1,687 mm) per year [28] in the far northwest hills, compared to 43.66 inches (1,109 mm) per year at Oregon State University, which is located in the center of Corvallis.
A total of three of the systems have hit Oregon since Dec. 1, bringing around 5 inches of rainfall in the Willamette Valley and over 6 inches on the Oregon Coast.
Over the contiguous United States, total annual precipitation increased at an average rate of 6.1 percent per century since 1900, with the greatest increases within the East North Central climate region (11.6 percent per century) and the South (11.1 percent). Hawaii was the only region to show a decrease (−9.25 percent). [89]
The higher rainfall totals come from longer-term NOAA forecasts across seven days. Bryant said Oregon said totals as high as 4 to 5 in the valley and 10 to 15 in the mountains was possible, but ...
Rainfall totals of 1 to 3 inches across the region, and 2 to 5 inches in the Oregon Coast Range, along with snowmelt, could lead to some localized flooding. ... Oregon weather forecast: Heavy rain ...
Average annual rainfall is 60.74 inches (1,543 mm) and there are an average of 138 days with measurable precipitation. The wettest year was 1996 with 95.35 inches (2,422 mm) and the driest year was 1976 with 31.69 inches (805 mm). The most rainfall in one month was 26.99 inches (686 mm) in November 1973.