Hottest and Coldest Temperatures Ever in Philadelphia on June 21

On June 21st in Philadelphia, weather conditions varied over the years. In 1988, temperatures soared to a scorching 97.0°F, marking the hottest recorded temperature. Conversely, in 1968, the coldest temperature hit 48.0°F. On average, the temperature for this date stands at 73.53°F. The average high temperature is 77.96°F, while the average low temperature is 69.09°F. During these years, an interesting news item occurred in 1968 when Apollo 8 successfully orbited the moon, becoming the first manned spacecraft to do so, paving the way for future lunar landings.