Seattle averages 37.49 inches of precipitation a year, with the vast majority falling as rain instead of snow. Official precipitation totals for the city are measured at Sea-Tac Airport, which is actually located south of the Seattle city limits. Regardless, Seattle’s precipitation has been logged there since 1945—with records from 1948 onward now digitized by the National Climatic Data Center. Below are two graphs that, together, show Seattle’s yearly precipitation from 1948 to present. The third chart lists Seattle’s top ten wettest days, with the record-setting rains of Oct. 20, 2003 ranking number one.
Note: Data in all charts from records taken at Sea-Tac Airport.