Hottest and Coldest Temperatures Ever in Philadelphia on April 20

On April 20th, Philadelphia experiences a range of temperatures based on historical data. The hottest recorded temperature for this date was 90.0°F in 1976, while the coldest temperature occurred in 1983, plunging to 32.0°F. The average temperature on this day is 55.94°F, with an average high of 62.52°F and an average low of 49.36°F. In 1976, an interesting news item unfolded as the nation's first successful commercial space flight took place, with the Viking 1 spacecraft landing on Mars and capturing the attention of the world.