Hottest and Coldest Temperatures Ever in Allentown on June 21

On June 21st in Allentown, the temperature reached a record high of 95.0°F in 1953, while in 1968, the coldest temperature ever recorded was 45.0°F. On average, the weather on this date is typically pleasant, with an average temperature of 71.80°F, a high of 75.84°F, and a low of 67.75°F. In the year 1953, an interesting news item is that the first successful ascent of Mount Everest was accomplished by Sir Edmund Hillary and Tenzing Norgay, marking a historic achievement in mountaineering.