Heat and other climate impacts like floods and storms affect voters, candidates and poll workers in different ways at different times, and can even tip election results, researchers and officials report.

As she canvassed for Zohran Mamdani in New York City on Tuesday last week, Batul Hassan should have been elated. Her mayoral candidate—a 33-year-old state assemblymember—was surging in the polls and would within hours soundly defeat Andrew Cuomo on first preference votes in the Democratic primary election.

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