Welcome to ‘third winter’, the Chicago season where the last big snowstorm can fall as late as May

Seems like the third winter in Chicago runs through March on average. Looking back at 136 years of local weather data, Chicago has experienced its final measurable snow as early as Feb. 28 (in 1994) and as late as May 11 (in 1966). That’s why March 31 is the date of the average last significant snowfall in Chicago.

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