San Francisco "mosquito days" increased by 42 days due to climate chaange

“What’s really causing this is the rise in minimum temperatures,” Trudeau said. “There are many more days where the minimum temperature in San Francisco is 50 degrees or above.”

The number of mosquito-friendly days around the coastal Bay Area has increased dramatically as the cooler days warm up, but San Francisco’s warmer days on average are still well below 95 degrees, making it a sweet spot for mosquitos.