Hottest and Coldest Temperatures Ever in Washington DC on July 21

On July 21st in Washington D.C., the weather is known to be warm and summery. The hottest temperature ever recorded on this date was 100.9°F in 1957, while the coldest temperature ever recorded was 57.9°F in 1965. On average, the temperature for July 21st is 79.92°F, with an average high of 84.48°F and an average low of 75.36°F. In 1957, the same year the highest temperature was recorded, an interesting news item is that the Soviet Union successfully launched the first-ever artificial satellite, Sputnik 1, marking the start of the space age.