Hottest and Coldest Temperatures Ever in Philadelphia on December 11

On December 11, the weather in Philadelphia is known to vary, and historical records indicate extreme temperature ranges. The highest temperature ever recorded on this date was 68.0°F in 2021, highlighting an unusually warm day. Conversely, the coldest temperature on record for December 11 occurred in 1968, reaching 10.0°F, indicative of the potential for frigid conditions. On average, Philadelphia experiences an estimated temperature of 38.03°F on this day, with an average high of 44.92°F and an average low of 31.14°F. In 1968, aside from the cold weather, a notable news item was the launch of the Apollo 8 spacecraft, becoming the first manned mission to orbit the Moon, a significant achievement in human space exploration.