Relationship between daily heat stroke mortality and temperature based on daily data

Abstract

The relationship between daily heat mortality and temperature was studied using the Vital Statistics data from 1999 to 2014. For each prefecture, average heat mortality in each bin of daily maximum temperature with a width of 1 deg was obtained, and the threshold temperature (T*) at which heat mortality exceeds a certain value was defined. It was found that T* was in positive correlation with summer mean temperature, indicating that heat stroke deaths occurs at a lower temperature in a region of cooler summer climate. It was also found that T* was lower on days of higher relative humidity.