Impacts of Climate Change and Land Use  on the Southwestern United States
Review of Variability in the North American Monsoon

Annual Precipitation Graphs for Selected Sites

Figure 1. Seasonal distribution of precipitation for southwestern North America. The largest peaks in mid-to-late summer rainfall (i.e., monsoonal)are found in northwestern Mexico. Note that northeastern Mexico and Texas display early summer/early fall precipitation peaks. Areas south of the broken line receive 50% of their annual rainfall during July, August and September (after Douglas et al. 1993).
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