Hottest and Coldest Temperatures Ever in Pittsburgh on December 21

On December 21st, Pittsburgh experienced a range of temperatures, from a record-breaking high of 66.9°F in 1967 to a chilling low of -6.0°F in 1989. The average temperature for this date is typically 30.78°F, with an average high of 39.54°F and an average low of 22.03°F. Looking back at the historical records, it's fascinating to note that in 1967, the same year when Pittsburgh recorded its highest temperature for this date, the city also became the first in the United States to have a computerized air traffic control system implemented.