I grew up in Beaumont TX—and mosquitoes were a fact of life there—and they were big and black!
Once, our family was transferred to Williston, ND. I could not believe the mosquitoes they have (or had there, though this was many years ago, so maybe they have solved it since.)
Two things struck me about Williston (which I came to love): There was no hot lunch program in their schools, so all the kids walked home for lunch—and the mosquitoes!
The kids walking on the sidewalks actually had black clouds of mosquitoes following them as they walked. I would have thought the extreme cold winters up there would have killed all of the mosquitoes, but apparently not….
The winters do, in winter. Nobody gets bit by mosquitoes then. You need an early spring with warm temps to hatch them out, then a cold snap for a week and you won't see the skeets again til July.