Climate change is taking some of the chill out of Halloween, according to a new analysis from Climate Central.

According to the climate research organization, October nighttime temperatures have been rising across most major U.S. cities over the past five decades, Big picture view: Climate Central analyzed October nighttime temperatures in 246 U.S. cities from 1970 to 2025 and found that 93% of them experienced warming during that period.

Across the 228 cities where temperatures increased, October nights warmed by an average of 3. 4 degrees Fahrenheit.