Descriptive analysis
Ethnoracial groups lived in varying concentrations throughout the study region—white people were overrepresented in New England (cooler climate), and Black people were overrepresented in the South Atlantic (warmer climate). Therefore, we first examined within-region CDDs by state and year. For example, Figure S1 shows distinct temperature profiles by ethnoracial groups in some states. We explored the cooling season of 2010, the warmest in the dataset. In New York state, white people experienced a wide distribution of exposures for which the mean was considerably lower than for Asian, Black, and Latino people. Other states showed more overlapping distributions but distinct bimodal patterning, as in West Virginia, potentially due to urban/rural development patterns. Table S1 shows population-weighted statewide CDDs per year.