<P> The Pacific Ocean , the moisture - laden air above it , and the storms moving from it over the Oregon coast , are major factors in the state 's precipitation patterns . As humid ocean air flows east from the ocean and encounters the Coast Range , it rises steeply , cools , and loses moisture through condensation , which produces heavy rain . The heaviest precipitation in the state occurs at 2,000 to 4,000 feet ( 610 to 1,220 m ) above sea level in these coastal mountains . At lower elevations along the coast , orographic precipitation is less intense but still produces 60 to 80 inches ( 1,500 to 2,000 mm ) a year . </P>
<P> The Pacific Ocean , the moisture - laden air above it , and the storms moving from it over the Oregon coast , are major factors in the state 's precipitation patterns . As humid ocean air flows east from the ocean and encounters the Coast Range , it rises steeply , cools , and loses moisture through condensation , which produces heavy rain . The heaviest precipitation in the state occurs at 2,000 to 4,000 feet ( 610 to 1,220 m ) above sea level in these coastal mountains . At lower elevations along the coast , orographic precipitation is less intense but still produces 60 to 80 inches ( 1,500 to 2,000 mm ) a year . </P>
where does it rain the most in oregon
where does it rain the most in oregon
the Coast Range
the Coast Range