Hottest and Coldest Temperatures Ever in Philadelphia on July 21

On July 21st in Philadelphia, the highest temperature ever recorded was 100.9°F in 1957, while the coldest temperature was recorded at 51.1°F in 1966. The average temperature for this date stands at 77.91°F, with the average high temperature reaching 82.46°F and the average low temperature at 73.35°F. Looking back at the year 1957, an interesting news item was the Soviet Union's successful launch of the spacecraft Sputnik 2 with the first living animal, a dog named Laika, on board. This historic event marked the first-ever orbit of a living creature around the Earth.