Climate Central analyzed average annual temperature trends since 1970 in 49 states and 242 U.S. cities to understand how temperatures across the country have changed as heat-trapping pollution has continued to climb.

The fastest-warming U.S. states from 1970 to 2025 are:

• Alaska
• New Jersey
• New Mexico
• Delaware
• Massachusetts
• Vermont

The fastest-warming U.S. cities are:

• Reno, NV
• Las Vegas, NV
• El Paso, TX
• Burlington, VT
• Tyler, TX

This Climate Matters analysis is based on open-access data from the National Oceanic and Atmospheric Administration (NOAA). See Methodology for details.