Precipitation in the Rogue basin varies greatly from place to place and season to season. At Gold Beach on the Pacific Coast it averages about 80 inches (2,000 mm) a year, whereas at Ashland, which is inland, it averages about 20 inches (510 mm).[21] The average annual precipitation for the entire basin is about 38 inches (970 mm).[21] Most of this falls in winter and spring, and summers are dry.[21] At high elevations in the Cascades, much of the precipitation arrives as snow and infiltrates permeable volcanic soils; snowmelt contributes to stream flows in the upper basin during the dry months.[18] Along the Illinois River in the lower basin, most of the precipitation falls as rain on shallow soils; rapid runoff leads to high flows during winter storms and low flows during the dry summer.[18] Average monthly temperatures for the whole basin range from about 68 °F (20 °C) in July and August to about 40 °F (4 °C) in December.[21] Within the basin, local temperatures vary with elevation.[21]
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