noun, plural ambiguities. 1. doubtfulness or uncertainty of meaning or intention: to speak with ambiguity; an ambiguity of manner. 2. an unclear, indefinite, or equivocal word, expression, meaning, etc.: a contract free of ambiguities; the ambiguities of modern poetry. Origin of ambiguity.
With four distinct seasons, Boston's weather is forever changing. Summer can be delightful with the ocean breezes helping keep the humid temps in control. Evening temperatures can be cool and may require a light sweater. And a pop up thunderstorm is not uncommon, so you may want to include an umbrella in your bag.
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.