 According to the United States Census Bureau, the city has a total area of , of which, of it is land and of it (36.36%) is water.Whittier has a subpolar oceanic climate climate ("Cfc") using the -3 °C isotherm and a subarctic climate using the 0 °C isotherm under the Köppen climate classification, and has an annual precipitation of .It is the wettest city in Alaska and the United States, receiving significantly more annual precipitation than Yakutat and Ketchikan which are the second- and third-wettest cities in Alaska, respectively.