This period aligns with the peak of the Pacific storm season, where atmospheric rivers deliver concentrated moisture to the region. Peak Activity Period November usually stands out as the single wettest month, frequently exceeding 20 inches of rain.
Understanding Ketchikan's Rain Forest Climate and Rainfall Patterns
Many cities in the contiguous United States receive less than 30 inches of rain per year, making the Southeast Alaskan climate nearly five times wetter. Monthly Distribution and Wettest Months Rainfall is not evenly distributed throughout the year in Ketchikan.
Comparison to Other Regions When compared to national averages, Ketchikan's rainfall is exceptionally high. The city receives substantial precipitation throughout the year, supporting the dense vegetation that surrounds the Tongass National Forest.
Understanding Ketchikan's Rain Forest Climate and Weather Patterns
Roads must withstand erosion, and wooden structures are treated to resist the persistent damp environment. Average Annual Rainfall Totals Meteorological data collected over several decades shows Ketchikan averages between 140 and 160 inches of rainfall annually.
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