What's the average life span of mosquitoes? Assuming the climate in Iceland has become warm enough for them to survive there, how did they get there in the first place? Is the atmosphere just full of insect eggs?
It is remarkable this is the first time mosquitos have been found in the wild in Iceland though. Even if they died out in the winter, you would expect some to hide in shipping containers and lay eggs all summer. Which is how we got Tiger Mosquitos in New Jersey, and now it doesn't get cold enough to kill them and it is so much worse than it used to be.
What did you think the city would do about it?
They typically survive the winter in egg form.