Large American cities with less than 20 inches on average of rain and snow a year:

Las Vegas, Nevada 4.2
Phoenix, Arizona 8.2
Riverside, California 10.3
San Diego, California 10.3
Los Angeles, California 12.8
Denver, Colorado 15.6
San Jose, California 15.8
Salt Lake City, Utah 16.1
Sacramento, California 18.5

These precipitation totals are averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center. The major cities included in the weather rankings represent the 51 metropolitan areas in the United States with the biggest populations, all those with over one million people in 2010, according to the US Census Bureau.