The redwoods grow on brown humus-rich loam which may be gravelly, stony or somewhat sandy. Annual precipitation in the park ranges from 39.4 inches (1,000 mm) in the lower valley to 47.2 inches ( 1,200 mm) higher up in the mountain slopes. Rainfall is heavy during the winter and summers are almost completely dry with the exception of fog drip caused by the fog passing through the trees. The monument remains cool and moist year round with daytime temperatures averaging between 40 and 70 degrees Fahrenheit ( 4 to 21 ☌). The fog is also vital for the growth of the redwoods as they use moisture from the fog during drought seasons, particularly during dry summers. Due to its proximity to the Pacific Ocean, the forest is regularly shrouded in a coastal marine layer fog, contributing to a wet environment that encourages vigorous plant growth. The Muir Woods National Monument is an old-growth coastal redwood forest. Geography Entrance To Muir Woods National Monument Ecosystem It protects 554 acres (224 ha), of which 240 acres (97 ha) are old growth coast redwood ( Sequoia sempervirens) forests, one of a few such stands remaining in the San Francisco Bay Area. The Monument is part of the Golden Gate National Recreation Area, and is 12 miles (19 km) north of San Francisco. It is located on Mount Tamalpais near the Pacific coast in southwestern Marin County, California. Muir Woods National Monument is a United States National Monument managed by the National Park Service and named after naturalist John Muir.
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