According to official National Weather Service records the period from June 1-July 13 was the hottest such period in Philadelphia in 138 years.
The air was as toasty as an electric blanket and the official high hit 94, sprinklers were transformed into water toys.
The region has experienced four heat waves. The longest was five days, that was dangerous ones.
Two heat-related deaths have been reported in Philadelphia, where the vulnerable, elderly live-alone population is concentrated.
Philadelphia has a heat-alert program, which alerts block captains to look in on the elderly and activates a hotline.
The American Red Cross reminds that everyone is at risk when temperatures rise above 90 degrees, with the elderly and the very young most susceptible to injury and even death.
Signs of heat-related illnesses include nausea, dizziness, flushed or pale skin, heavy sweating and headaches.
Persons with heat-related illness should be moved to a cool place and given cool water to drink, and ice packs or cool wet cloths should be applied to the skin.
If a victim refuses water, vomits or loses consciousness, call 9-1-1 or your local emergency number immediately.
Starting Monday, though, another heat wave could start, with the high threatening 90, followed by the mid 90s on Tuesday, according to the weather service. The 10-day forecast at weather.com, however, sees a string of highs in the upper 80s next week.
For more on the forecast, go to https://go.philly.com/weather.