Mosquitoes are cold-blooded creatures, and their temperature is essentially the same as their surroundings. They function best at 80 degrees Fahrenheit, become lethargic at 60 degrees Fahrenheit, and cannot function below 50 degrees Fahrenheit. When temperatures drop below 50 degrees Fahrenheit, some mosquitoes become inactive and eventually die, while others have adapted to cold weather and hibernate. Mosquitoes in temperate climates enter hibernation to live through the winter. Mosquitoes that have winter hardy eggs hibernate as embryos in eggs laid by the last generation of females in late summer. The eggs are usually submerged under ice and hatch in spring when water temperatures rise. Other kinds of mosquitoes overwinter as adult females that mate in the fall, enter hibernation in animal burrows, hollow logs, or basements, and pass the winter in a state of torpor. In summary, mosquitoes go away when the temperature drops below 50 degrees Fahrenheit, but some species have adapted to cold weather and hibernate.