Hottest and Coldest Temperatures Ever in Boston on May 15

On May 15th in Boston, the weather history showcases some notable extremes. In 1951, the temperature soared to a scorching high of 89.1°F, marking the hottest recorded temperature for this date. Conversely, in 1985, Boston experienced its chilliest May 15th, with the mercury plummeting to 42.1°F, the coldest ever recorded. On average, this day tends to be milder, with a mean temperature of 57.42°F, a high of 62.19°F, and a low of 52.66°F. In a fascinating piece of news from those years, 1951 witnessed the iconic Fenway Park debuting its legendary Green Monster, a towering green wall that quickly became an iconic feature of the ballpark, offering a unique backdrop for baseball games and captivating fans until this day.