weather in boston late march
Frost can also show up in March, April and November. The city averages one day a year of extreme cold, when the temperature plummets to zero degrees Fahrenheit or less. Periodically from December to March, Boston's daytime high never makes it above 32 degrees. On average the city gets 25 days a year when the temperature remains below freezing. Crisp days mostly occur in January, but can happen anytime in winter and even in March.