Hottest and Coldest Temperatures Ever in Philadelphia on August 21

On August 21st in Philadelphia, temperatures reached a high of 95.0°F in 2009, making it the hottest temperature recorded on this date. Conversely, in 1977, the city experienced a chilly low of 55.0°F, marking the coldest temperature ever recorded for August 21st. The average temperature for this date is 73.74°F, with an average high of 77.86°F and an average low of 69.63°F. In light of these temperature fluctuations, it is fascinating to note that in the same year as the coldest temperature, in 1977, the first personal computer, known as the Commodore PET, was released, revolutionizing the world of technology.