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5:06 PM

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This is the date when Lake Champlain freezes over, using averages that extend back to 1816, though the lake does not freeze completely every winter. The colder weather of the 19th century, and the more meticulous observations of the lake over the past one hundred years, places this date into question, as the lake has only frozen over in half the winters since 1970, the last time in February 2015.