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.
Boston weather in September - Air is warm and dry, sky is blue . . . a month of sparkling days. October - Dry, warm days full of autumn colors . . . although we occasionally get snow toward the end of the month. November weather - Gorgeous days . . . but colder, with a nip in the air . . . winter is coming.