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Wikipedia: Oregon's climate varies greatly from the western and eastern regions of the state. An oceanic climate (also called "west coast marine climate") predominates in Western Oregon, and a much drier semi-arid climate prevails east of the Cascade Range in Eastern Oregon. Major factors determining Oregon's climate include the large semi-permanent high pressure and low pressure systems of the north Pacific Ocean, the continental air masses of North America, and the Cascade mountains.
![[The High Desert region of Oregon.]](http://images.ookaboo.com/photo/s/Oregon_High_Desert_s.jpg "The High Desert region of Oregon.")
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