The Compressed Mortality database contains mortality and population counts for all U.S. counties for the years 1979 to 2005. Counts and rates of death can be obtained by underlying cause of death, state, county, age, race, sex, and year.
The impact of heat on death rates begins at relatively low temperatures during hot weather, finds research in the Journal of Epidemiology and Community Health. Researchers analysed temperature readings from the Meteorological Office and death rates from the Office of National Statistics for London between 1976 and 1996.