In a few decades, a summer in Denver might feel like one in El Paso, according to climate research commissioned by three Front Range cities. Denver, Boulder and Fort Collins are likely to see hot days more frequently each year, including an average of seven days with temperatures exceeding 100 degrees, according to three studies released Thursday by the Louisville-based Rocky Mountain Climate Organization. They also predict, with less certainty, an increase in severe storms dropping significant rain or snow. If heat-trapping emissions into the atmosphere keep increasing, researchers found, the northern Front Range climate by 2050 will be fundamentally different. “By the middle of the century, summers here will be as hot as summers have been recently in El Paso,” said Stephen Saunders, director of RMCO, who led the research. “Half the houses in Denver today do not have air conditioning.