Fall is getting warmer due to climate change. About 95% (234) of the 246 cities analyzed have warmed since 1970. And 57% (134) of those cities have warmed at least two degrees.
Of the 246 cities, 68% (167) have seen at least seven more days of above-average fall temperatures compared to 1970. Ten locations recorded one additional month of hotter-than-normal days.
Warmer fall temperatures raise public health risks such as heat-related illness, mosquito-borne disease, pollen allergies, and worsening air pollution.