Hilo overlooks Hilo Bay and is situated upon two shield volcanoes; Mauna Loa, an active volcano, and Mauna Kea, a dormant volcano. Hilo has a total area of 58.4 square miles (151.3 km2), 54.3 square miles (140.6 km2) of which is land and 4.1 square miles (10.6 km2) of which (7.10%) is water.
Hilo features a tropical rainforest climate (Köppen Af), with substantial rainfall throughout the course of the year. Hilo's location on the eastern side of the island of Hawaiʻi, (windward relative to the trade winds), makes it the third wettest designated city in the United States behind the southeast Alaskan cities of Ketchikan and Yakutat and one of the wettest in the world. An average of around 126.72 inches (3,220 mm) of rain fell at Hilo International Airport annually between 1981 and 2010, with 275 days of the year receiving some rain.,[10] which is the most rainy days for any place in the Northern Hemisphere and exceeded only in parts of Aisén and Magallanes in Chile. At some other weather stations in Hilo the annual rainfall is above 200 inches (5,100 mm).[11]
--- http://en.wikipedia.org/wiki/Hilo,_Hawaii