In a study done by the nonprofit organization Climate Central, with 242 locations assessed from 1979 to 2022, it was noted that the Southeast experiences about 218 mosquito days a year. While the Upper Midwest sees about 31% of the year with mosquitos. 173 locations of those 242 locations experienced an increase in annual mosquito days. The average increase for those locations was 16 additional days per year.

The highest increase in mosquito days was observed in Santa Maria and San Francisco California with 43 and 42 additional mosquito days per year.

But even more northern places like Burlington Vermont or Seattle, Washington, had an increase of over 30 mosquito days additionally each year between 1979 and 2022.

Warmer and rainier weather is to blame for the increase in mosquito days across many locations. Mosquitoes thrive in humid environments, and where there is more stagnant water, such as puddles.

The best you can do to protect yourself and others from mosquito bites, which often spread disease, is to clear standing water. Use repellent when outdoors, especially on warm and humid days.