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Campers and hikers flock to the park from mid-June to early September. Crowds disappear in winter, but you'll have to contend with frequent rains and nasty potholes on side roads. Temperatures fluctuate widely throughout the park: the foggy coastal lowland is much cooler than the higher-altitude interior.
The average annual rainfall here is 90 to 100 inches, and during dry summer months thick fog rolling in from the Pacific veils the forests, giving redwoods a large portion of their moisture intake.