Hottest and Coldest Temperatures Ever in Philadelphia on August 15

On August 15th in Philadelphia, the highest temperature ever recorded was 98.1°F back in 1988, while the lowest was 50.0°F in 1963. The average temperature for this date is 75.64°F, with an average high of 79.37°F and an average low of 71.91°F. Looking back to 1988, an interesting news item is that it marked the debut of NASA's Space Shuttle Discovery, which completed its successful return to flight after the Challenger disaster in 1986.