and development possible in the otherwise inhospitable desert environment of the Coachella Valley. Major earthquakes have affected the Coachella Valley. For instance, the 1992 Landers earthquake caused some damage in the valley. An earthquake of local origin which caused considerable damage was the 1986 North Palm Springs earthquake, which registered at a magnitude of 6.0, injuring 29 people and destroying 51 homes. Climate In the summer months daytime temperatures range from to and nighttime lows from to . During winter, the daytime temperatures range from to and corresponding nights range from to making it a popular winter resort destination. The surrounding mountains create Thermal Belts in the immediate foothills of the Coachella Valley, leading to higher night-time temperatures in the winter months, and lower daytime temps during the summer months. Due to its warm year-round climate the region's agricultural sector produces fruits such as mangoes, figs and dates. The Valley is the northwestern extension of the Sonoran Desert to the southeast, and as such, is extremely arid. Most precipitation falls during the winter months from passing mid-latitude frontal systems from the north and west, nearly all of it as rain, but with snow atop the surrounding mountains. Rain also falls during the summer months as surges of moisture from both the Gulf of Mexico and the Gulf of California are drawn into the area by the desert monsoon. Occasionally, the remnants of a Pacific tropical cyclone can also affect the valley. In 1976, Tropical Storm Kathleen brought torrential rain and catastrophic flooding to the Coachella Valley as it swept in from the Pacific, traversing the region from south to north. A haboob powerful enough to have a significant impact on the Coachella Valley can happen every two years. Ecology This desert environment hosts a variety of flora and fauna, including the endangered California Fan Palm, Washingtonia filifera, Bighorn sheep inhabit the Santa Rosa and San Jacinto mountain ranges, and the fringe-toed lizard, an indigenous desert reptile whose numbers are increasing under the U.S. Endangered Species Act. Desert wildlife in the Coachella Valley includes localized subspecies of ants, bats, beetles, blackbirds, bobcats, coyotes, diamondbacks, fleas, foxes, gnats, gophers, hawks, horseflies, jackrabbits, kangaroo rats, mosquitoes, mountain lions, pigeons, quails, rattlesnakes, ravens, roaches, roadrunners, scorpions, spiders, termites, ticks, vipers, wasps, whip scorpions or "vinegaroons", and wildcats. See also: Geography of the Colorado Desert Fauna of the Colorado Desert Sonoran Desert wildflowers Coachella Valley