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Haleakala began growing on the ocean floor roughly 1-2 million years ago. It erupted most recently in 1790 at La Perouse Bay. Hualalai is an active volcano. The resort town of Kailua is on the southwest flank of the volcano. Hualalai last erupted in 1801 and sent lava from a vent on its northeast rift down to the ocean.
Cool temperatures, intense solar radiation, and rapidly moving clouds are characteristic. On average, the temperature drops about 3Â°F for every 1,000 foot rise in elevation (or approximately 5Â°C for every 1,000 meter elevation rise), making the 10,023 foot (3055m) summit of HaleakalÄ about 30Â°F (or 17Â°C) cooler than the coast. Year-round summit temperatures range between below freezing to highs of 50Â°-65Â°F (10-18Â°C).