In Arizona, what type of water source is likely to dry up during the summer months?

In Arizona, non-perennial streams are characterized by their seasonal flow patterns, which often results in them drying up during the summer months due to decreased rainfall and higher evaporation rates. These streams may flow in spring during snowmelt or after rainfall but can run dry during arid periods.

Perennial streams, on the other hand, maintain a consistent flow throughout the year, sustained by groundwater or consistent rain, making them less likely to dry up during summer. Groundwater aquifers and water wells are also generally reliable sources of water since they draw from underground reservoirs that tend to be less affected by seasonal weather changes. Thus, among the listed options, non-perennial streams are the ones most susceptible to drying up in the summer months, making this the correct choice.