Reno and Las Vegas are two of the “fastest warming” cities in the United States. Reno is number one, Las Vegas is number three in the study by “Climate Central,” and The Weather Channel. Reno’s temperature is rising an average of 1.39 degrees Fahrenheit per decade over the last five decades, Las Vegas is third, with the average temperature rising 1.04 degrees per decade. The study claims this is evidence of global warming.