Hottest and Coldest Temperatures Ever in Boston on June 21

On June 21st in Boston, the weather has seen extremes over the years. In 2012, the city experienced scorching heat with a record-breaking temperature of 96.1°F, while in 1967, it endured a chilly day with the mercury dropping down to 50.0°F. On average, June 21st in Boston tends to be pleasant, with an average temperature of 69.59°F. The high temperature hovers around 74.45°F, while the low temperature typically reaches 64.73°F. Speaking of interesting news, in 1967, the year when Boston recorded its coldest temperature, The Boston Red Sox clinched the American League pennant for the first time in 21 years, bringing joy to the city's baseball fans.