WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Low temperatures for the day

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Dear Tom,
Recently your forecast said,"A frigid start to the day as temperatures begin in the single
digits," but then you show the low temperature as 18 degrees. My thermometer showed
8 degrees! How do you figure the low temperature?

Peggy Gudbrandsen

Dear Peggy,
We always present temperatures on this weather page in chronological order. The
expected high temperature on a given day appears first, followed by the expected low
temperature during the following nighttime period.

The situation that you described, "A frigid start to the day ...," refers to early-morning
temperatures expected before that day's forecast afternoon high temperature. The low
temperature is the predicted minimum temperature during the following night.
Minimum temperatures usually occur in the early morning, approximately at daybreak,
of the next calendar day.