The average temperature on the big island ranges from 71 to 77 degrees Fahrenheit on the coastal regions with temperatures on the low 70's from October through April. The summits of Mauna Kea and Maona Loa are often blaneketed with snow. Average annual rainfall ranges from 10 inches at Kawaihae (near the west-facing Kohala Coast) to 128 inches at the Hilo Airport. Fifteen miles off the island's southeast coast yet another volcano, Lo'ihi, is erupting 3,000 feet below the surface of the ocean. While it will still be several thousand years before this volcano breaks the sea's surface, it has already risen more than 10,000 feet from the sea floor and has a crater that measures three miles across. Kamehameha the Great, who unified the Hawaiian Islands under one king for the first time in 1810, is believed to have been born in the Big Island's North Kohala area. Captain James Cook, who is widely considered to be the first European to set foot in the Hawaiian Islands, was killed at Kona's Kealakekua Bay in 1779. The Big Island's official flower is the lehua 'ohi'a. The island's official color is red.