Hottest and Coldest Temperatures Ever in Pittsburgh on November 21

On November 21st in Pittsburgh, the temperature reached a highest-ever recorded temperature of 68.0°F back in 1953, while the lowest-ever recorded temperature was 14.0°F in 1969. On average, the temperature for this date is about 40.29°F, with a typical high of 48.83°F and a low of 31.74°F. In 1953, when Pittsburgh experienced an unusually warm November, a fascinating news item reported the successful unveiling of the first prototype for the polio vaccine, developed by Dr. Jonas Salk at the University of Pittsburgh. This breakthrough marked a significant milestone in medical history, offering hope in combating the devastating disease.