Mosquitoes are cold-blooded creatures, which means they are unable to regulate their body temperature and their temperature is essentially the same as their surroundings. Mosquitoes function best at 80 degrees Fahrenheit, become lethargic at 60 degrees Fahrenheit, and cannot function below 50 degrees Fahrenheit. In tropical areas, mosquitoes are active year-round. In temperate climates, adult mosquitoes of some species become inactive with the onset of cool weather and enter hibernation to live through the winter. Some kinds of mosquitoes have winter hardy eggs and 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. When temperatures drop below 50 degrees Fahrenheit, it causes some mosquitoes to become inactive and eventually die. However, many have adapted to cold weather. The winter months slow down insect reproduction and cause many to hibernate, with only a few that die. So, the answer to the question "what temperature do mosquitoes go away" is below 50 degrees Fahrenheit.