"Assigning deaths can also be tricky. Heat-associated deaths are generally not well documented; heat often contributes to death without being the direct cause and heat may not be considered as a potential cause of death. With respect to coronial records, it is not generally possible to identify heat-related deaths through autopsy alone: the circumstances around the death must also be understood. Thus, many deaths that are in fact heat-related will not necessarily be recorded as such."
https://riskfrontiers.com/insights/h...-new-analysis/