Results
We examined the relationships of ethnoracial composition, residential segregation, and air temperature in 13 states of the northeast and mid-Atlantic U.S., in addition to Washington D.C., using a metric of excess heat relevant to energy policy and planning for cooling needs: cooling degree days (CDDs; i.e., the sum of degrees Fahrenheit >65 °F for each daily mean temperature) in 2003–2019. This region represents 17,733 census tracts nested in 434 counties, representing approximately 72.4 million people according to the 2010 decennial census.