There's enough ground water here in the Tucson area to supply the existing population with potable drinking water. Area farms, however, rely heavily on water from the Coloradon River transported via the CAP canal.
After the nuclear exchange, regional "water wars" between states and municipalities could transpire (the SW states are fighting over it now, IRL). This could cut the Tucson area's access to that crucial CO River water and more or less render large scale agriculture impossible.
Climate-wise, it's quite lovely here for 7 months of the year. Mid-May through mid-October, however, is unbearably hot. It's no surprise that the population of Arizona didn't really grow until the advent of air conditioning.
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