Historic Precipitation (graphs)

The Mojave Desert is currently experiencing a "wet period" (planetbiomes.org). The precipitation levels of the Mojave have been known to fluctuate between such wet and dry periods, causing variations in the landscape and plant growth accordingly. Though the present wet period has helped maintain the vegetation in the desert despite anthropogenic disturbances, a future dry period may result in an severe loss of native plants.

The following graphs are taken from http://mojave.usgs.gov/climate-history/.

Works cited:

http://www.blueplanetbiomes.org/mojave_climate.htm