Looking at the scenario where we fail to invest in mitigation and stick to our old business-as-usual ways, we see that by mid-century the average American will likely experience two to three times more hot days. And, by late-century, Americans could experience as much as three months over 95°F each year. The 1-in-20-year extreme heat events—like the one that happened in Chicago way back in 1995—will happen about every other year.