This News Bites: More Mosquito Days
According to studies from the National Institutes of Health, mosquitoes survive best at temperatures between 50-95°F and a relative humidity of 42% or more. These conditions are increasing in 64% of the 239 sites analyzed in the contiguous U.S., from the 1980s to the 2010s.
Increases are highest along the Pacific Coast, Ohio Valley, and Northeast—including an extra month in San Francisco, Santa Maria (Calif.) and Seattle. Most sites with a decrease are in southern areas—where more of the summer is getting too hot for mosquitoes.
With longer mosquito seasons, the risk goes up for mosquito-borne diseases. West Nile virus is projected to spread with climate change, and temperature ranges for the transmission of three other diseases are getting more common in 94% of cities analyzed.