Hottest and Coldest Temperatures Ever in Boston on December 21

On December 21st in Boston, Massachusetts, the weather has seen quite a range of temperatures over the years. In 2018, it reached a scorching high of 64.9°F, marking the hottest temperature ever recorded for this date. Conversely, in 1955, a bone-chilling low of -2.0°F was experienced, making it the coldest temperature ever recorded. On average, Boston tends to have a temperature of 32.77°F on this day, with an average high temperature of 41.68°F and an average low temperature of 23.87°F. In the year 1955, amidst the chilly temperatures, an interesting news item emerged when Rosa Parks sparked the Montgomery Bus Boycott in Alabama, igniting a significant Civil Rights Movement in the United States.