Philadelphia recorded its first heat-related death this year during last week's heat wave, when temperatures were in the 90's over two days.

What we do to measure heat-related death is look at the long-term baseline, the average.

That was the system used to determine the 15,000 heat-related deaths in 1980.

That compares with 95 heat-related deaths in all of the previous 12 months.

It made the finding after studying the 118 heat-related deaths reported by Philadelphia's health department last year.

The city's first two heat-related deaths were reported on Saturday.

The police said they had no reports of heat-related deaths but expected some to occur.

Since the 1990's, other cities like Chicago have made that calculation, because it can provide a more complete picture of heat-related deaths.

There is no Federal definition of a heat-related death, in which experts say the heat wears down the bodies defenses.

But he acknowledged, "Not every heat-related death is manifested by heat stroke."