Slope instability of the volcanoes has generated damaging earthquakes with related tsunamis, particularly in 1868 and 1975.
Because the islands are so far from other land habitats, life before human activity is said to have arrived by the "3 W's": wind (carried through the air), waves (brought by ocean currents), and wings (birds, insects, and whatever they brought with them). This isolation, and the wide range of environments (extreme altitude, tropical climate) produced a vast array of endemic flora and fauna (see Endemism in the Hawaiian Islands). Hawaii has more endangered species and has lost a higher percentage of its endemic species than any other U.S. state.
Several areas in Hawaii are under the protection of the National Park Service. Hawaii has two national parks: Haleakala National Park near Kula, on Maui, includes Haleakalā, the dormant volcano that formed east Maui; and Hawaii Volcanoes National Park in the southeast region of the island of Hawaiʻi, which includes the active volcano Kīlauea and its various rift zones.
There are three national historical parks: Kalaupapa National Historical Park in Kalaupapa, Molokaʻi, the site of a former Hansen's disease colony; Kaloko-Honokōhau National Historical Park in Kailua-Kona on the island of Hawaiʻi; and Puʻuhonua o Hōnaunau National Historical Park, an ancient place of refuge. Other areas under the control of the National Park Service include Ala Kahakai National Historic Trail on the island of ʻand the USS Arizona Memorial at Pearl Harbor on Oʻahu.
The Papahānaumokuākea Marine National Monument was proclaimed by President George W. Bush on June 15, 2006. The monument covers roughly 140,000 square miles (360,000 km2) of reefs, atolls and shallow and deep sea out to 50 miles (80 km) offshore in the Pacific Ocean, larger than all of America's National Parks combined.
Hawaii's climate is typical for the tropics, although temperatures and humidity tend to be a bit less extreme due to near-constant trade winds from the east. Summer highs are usually in the upper 80s °F, (around 31°C) during the day and mid 70s, (around 24 °C) at night. Winter day temperatures are usually in the low to mid 80s, (around 28 °C) and (at low elevation) seldom dipping below the mid 60s (18 °C) at night. Snow, not usually associated with tropics, falls at 4,205 metres (13,796 ft) on Mauna Kea and Mauna Loa on the Big Island in some winter months. Snow rarely falls on Haleakala. Mount Waiʻaleʻale, on Kauaʻi, has the second highest average annual rainfall on Earth, about 460 inches (11.7 m). Most of Hawaii has only two seasons: the dry season from May to October, and the wet season from October to April.
Local climates vary considerably on each island, grossly divisible into windward (Koʻolau) and leeward (Kona) areas based upon location relative to the higher mountains. Windward sides face cloud cover, so resorts concentrate on sunny leeward coasts.