New England's Dark Day

New England's Dark Day refers to an event that occurred on May 19, 1780, when an unusual darkening of the day sky was observed over the New England states and parts of Canada. [1] The primary cause of the event is believed to have been a combination of smoke from forest fires, [2] a thick fog, and cloud cover. The darkness was so complete that candles were required from noon on. It did not disperse until the middle of the next night. [3] [4]

Range of the darkness

According to Professor Samuel Williams of Harvard College, the darkness was seen at least as far north as Portland, Maine, and extended southwards to New Jersey. The darkness was not witnessed in Pennsylvania. [3]