Nighttime temperatures in many cities are rising twice as fast as daytime highs

Climate trends reveal a phenomenon known as asymmetric warming, where nighttime minimums rise significantly faster than daytime maximums. Data from over 26,000 daily readings shows that while only half of U.S. states have seen rising average temperatures since 1950, 80% are experiencing more extreme highs or warmer nights. In 70% of metropolitan areas, the urban heat island effect adds an extra 2 to 5 degrees Fahrenheit to evening temperatures.