Map showing the change in average summer temperature in the U.S. from 1970 to 2022. Areas designated by the USGS climate division and summer is defined as June 1 to August 31 of each year. Western U.S. had the most change, with the majority of California, Nevada, Oregon and New Mexico having a +4°F change. Costal portions of New Jersey and New York experienced similar changes. The Midwest had the least, with the majority of Iowa, Illinois, Kansas and South Dakota having +1°F change. The southeastern plains of New Mexico was the only location to experience +5°F change.