Hottest and Coldest Temperatures Ever in Washington DC on August 21

On August 21st, Washington D.C. experienced a hot day with temperatures reaching up to 96.1°F in 1959, marking it as the hottest ever recorded. However, the temperature dropped significantly to a chilly 57.9°F in 1969, the coldest ever recorded on the same date. The average temperature for August 21st is 75.68°F, with an average high of 79.79°F and an average low of 71.57°F. In 1959, amidst the scorching heat, the first ever direct-dial transcontinental telephone call was made, revolutionizing long-distance communication.