Every Texas region shares one system — the same maps, the same live radar, the same climate record. El Paso keeps its own clock and its own climate — Mountain time, Chihuahuan desert, and a year that is bone dry until the North American monsoon turns up in July and drops half the annual rain in eight weeks. The rest is sun, dust storms coming down the pass, and the occasional winter storm that closes I-10 over the Franklins.