From article:
According to the National Weather Service in Chicago, the intervening 252 consecutive days without snow was the second-longest snowless streak on record for the city, just behind the 254-day streak in 1999.
In 1999, the streak was mostly the result of a very warm November (the fourth-warmest on record in Illinois) that delayed the first flakes of fall until December 5.
In meteorology, a "trace" of precipitation is recorded when precipitation falls but is not enough to reach 0.01 inch of liquid precipitation or 0.1 inch of snowfall.
http://www.weather.com/news/weather-winter/chicago-snow-snowless-streak-20121114
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