<P> Across Oregon , the wet season runs from November through March , when the jet stream is strongest in the Northern Hemisphere . Precipitation is less in the months between winter and summer : April through June in the spring and September and October in the fall . Statewide , the dry months are July and August , when moisture arrives during afternoon thunderstorms , mainly in the mountains , and less often from storms that reach the north coast and adjacent counties . </P>
<P> Across Oregon , the wet season runs from November through March , when the jet stream is strongest in the Northern Hemisphere . Precipitation is less in the months between winter and summer : April through June in the spring and September and October in the fall . Statewide , the dry months are July and August , when moisture arrives during afternoon thunderstorms , mainly in the mountains , and less often from storms that reach the north coast and adjacent counties . </P>
when does the rainy season start in oregon
when does the rainy season start in oregon
November
November