Every Nevada region shares one system — the same maps, the same live radar, the same climate record. Three quarters of Nevada lives in one valley that gets four inches of rain a year, ringed by mountains that get thirty. The Spring Mountains stand 12,000 feet over the Strip and turn a July monsoon thunderstorm into a wash running full through a city built on the alluvial fan below — and the same range holds snow at Lee Canyon into April, forty-five minutes from a casino floor at 105 degrees.