Coachella Valley - Geography and Climate

Geography and Climate

The area is surrounded on the southwest by the Santa Rosa Mountains, by the San Jacinto Mountains to the west, the Little San Bernardino Mountains to the east and San Gorgonio Mountain to the north. These mountains peak at around 11,000 feet (3,400 m) and tend to average between 5,000 to 7,000 feet (1,500 to 2,000 m). Elevations on the Valley floor range from 1600 ft above sea level at the north end of the Valley to 250 ft below sea level around Mecca. Sometimes a weather system can come through one of the narrow passes, or up from the Gulf of California as Hurricane Kathleen did in September 1976. In the summer months daytime temperatures range from 104 °F (40 °C) to 112 °F (44 °C) and nighttime lows from 75 °F (24 °C) to 86 °F (30 °C). During winter, the daytime temperatures range from 68 °F (20 °C) to 88 °F (31 °C) and corresponding nights range from 46 °F (8 °C) to 65 °F (18 °C) making it a popular winter resort destination. Due to its warm year-round climate the region's agricultural sector produces fruits such as mangoes, figs and dates.

Although geographically the Valley is the northwestern extension of the Sonoran Desert to the southeast, the irrigation of over 100,000 acres (405 km²) of the Valley since the early 20th century has allowed widespread agriculture. In its 2006 annual report, the Coachella Valley Water District listed the year's total crop value at over $576 million or almost $12,000 per acre. The Coachella Canal, a concrete-lined aqueduct built between 1938 and 1948 as a branch of the All-American Canal, brings water from the Colorado River to the Valley. The Colorado River Aqueduct, which provides drinking water to Los Angeles and San Diego, crosses the northeast end of the Valley along the base of the Little San Bernardino Mountains (the Joshua Tree National Park).

The San Andreas Fault traverses the Valley's east side. Because of this fault, the Valley has many hot springs. The Santa Rosa Mountains to the West are part of the Lake Elsinore Fault zone. The results of a prehistoric sturzstrom can be seen in Martinez Canyon. The Painted Canyons of Mecca feature smaller faults as well as Precambrian, Tertiary and Quaternary rock formations, unconformities, badlands and desert landforms. Seismic activity is what triggers earthquakes, a natural, but occasionally destructive phenomena in the Coachella Valley. Fault lines cause hot water springs or geysers to rise from the ground. These natural water sources made habitation and development possible in the otherwise inhospitable desert environment of the Coachella Valley. Major earthquakes have affected the Coachella Valley. For instance, the Landers Earthquake in 1992 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.