Do you have a hard date when you stop tracking a season’s snowfall? –

Dear Tom,
Do you have a hard date when you stop tracking a season’s snowfall? If not, what date are you looking at for this year?
— Ed Polus, Western Springs
Dear Ed,
Snowfall is tracked whenever it occurs. However, a “snow season” is defined as running from July 1 through June 30 of the following year. That is, snow that falls during those dates constitutes one season’s snowfall. In Chicago, the latest occurring measurable snow in the spring was on May 11, 1966, when 0.2 inches of snow fell; the earliest measurable autumn snow was on Oct. 12, 2006, with 0.3 inches. June, July, August and September have never produced measurable snow here.
However, snow can occur in mountainous locations in the West all through the year — even in the summer — and so the July 1 and June 30 dates are significant.