Fig. 4.

Number of summer days (June 1 to September 30) with future mosquito population less than base mosquito population. In most locations a summer decrease in mosquito population is projected because of increased immature mortality at high temperatures and decreased larval and pupal habitat because of enhanced evaporation. The central and Gulf states experience the longest summer population dip because of the greater length and intensity of projected summer warming along with considerable drying. Locations further north and at higher elevations (especially along the Appalachians) experience a shallow dip because damaging high temperatures are less frequent and eastern locations receive greater precipitation under future climate. In the western United States, extremely dry summers limit sustained mosquito populations under both base and future climate conditions.