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Temperature has a well-established association with all-cause and cardiovascular mortality. Sudden cardiac death (SCD) and temperature have been studied in the short-term context, focusing on the hours and days leading up to the event, but there has been little investigation of medium- and long-term temperature trends and SCD. Therefore, the objective of this study was to investigate if there is an association between ambient air temperature and SCD in the long- and medium-term. Participants from the Nurses’ Health Study, a prospective cohort of married woman nurses in the US, began enrollment in 1976. Confirmed cases of SCD were identified using medical records and next-of-kin reports. Interpolated temperature data from the Oregon State University PRISM group were appended to geocoded participant addresses. We explored the linearity of temperature and SCD …