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Heat is known to cause illness and death not only at extreme temperatures, but also at moderate levels. Although substantial research has shown how summer time temperature distributions have changed over recent decades in the United States, less is known about how the heat index-a potentially more health-applicable metric of heat-has similarly evolved over this period. Moreover, the extent to which these distributional changes have overlapped with indicators of social vulnerability has not been established, despite the applicability of co-varying climatic and sociodemographic characteristics to heat-related health adaptations. Presented here is an analysis of trends in the median, 95th percentile, and 'warm-tail spread' (i.e., intra-seasonal range between the upper extreme and median) of warm-season (May-September) maximum heat index between 1979and 2018 across the conterminous US. Using40 years of data from the North American Regional Reanalysis dataset, it is shown that most of the US has experienced statistically significant positive trends in summertime heat, and that both the magnitude of trends and the shape of the frequency distributions of these measures vary regionally. Comparisons with data from the Social Vulnerability Index show that the most socially vulnerable counties appear to be warming faster than the least vulnerable, but that opposite patterns hold for trends in warm-tail spread. These findings may be applicable to further studies on climate change, heat adaptations, and environmental justice in the US.

Spatial patterns of recent US summertime heat trends: Implications for heat sensitivity and health adaptations