Long Term Averages
On average, five North Atlantic hurricanes or their remnants lead to rainfall across the contiguous United States each year, contributing between a tenth and a quarter of the annual rainfall to the southern United States. While many of these storms form in the Atlantic Basin, some systems or their remnants move through Mexico from the Eastern Pacific Basin. Tropical cyclones from the eastern Pacific bring nearly 20 percent of the average annual rainfall to southern California. The average storm total rainfall for a tropical cyclone impacting the lower 48 from the Atlantic Basin is about 16 inches/406 mm, with 70-75 percent of the storm total falling within a 24 hour period.
Read more about this topic: United States Tropical Cyclone Rainfall Climatology
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