Climate Central assessed mosquito weather trends from 1979 to 2022 in 242 U.S. locations. Over this period, 173 locations saw annual mosquito days increase—by 16 days on average.

For 64% of the contiguous U.S. (or 72% of the population), minimum (nighttime) temperatures were made at least twice as likely due to climate change on 15 or more summer nights in 2022.