Hottest and Coldest Temperatures Ever in Boston on October 21

On October 21st, Boston experienced varying temperatures over the years. The hottest temperature recorded was 80.1°F in 1979, while the coldest temperature was 30.0°F in 1974. On average, the temperature for this date is 53.24°F, with an average high of 58.77°F and an average low of 47.71°F. In an interesting news item from these years, in 1974, the Boston Marathon made history as the first officially recognized marathon open to women, with 11 women participating and completing the race.