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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]
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Bend, the region's largest city, only receives 12 inches (300 mm) of precipitation per year. Burns receives roughly 11 inches (280 mm) of precipitation annually, while Rome, in central Malheur County, and the official weather station at Whitehorse Ranch in southern Harney County receive only 8 inches (200 mm) in an average year. Some of the ...
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 ...
The average rainfall is 40.83 inches (1,040 mm), with the wettest "rain year" being from July 1973 to June 1974 with 75.59 inches (1,920.0 mm) and the driest from July 2000 to June 2001 with 20.40 inches (518.2 mm). [59] Measurements taken by NOAA over the past four decades have indicated a significant decline in average annual precipitation.
But last year’s record-setting precipitation was rather extraordinary. ... normal — making 2022-23’s precipitation above average and 2023-24 nearly there. ... staggering 7.54 inches after 16 ...
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.