The wind off the lake loses its playful nature and becomes a cutting force, slicing through light jackets. Average high temperatures drop from 70°F early in the month to 50°F by Halloween.
Recognizing Chicago's Cold Weather Transition Signs
The Transition from Summer to Fall September often feels like an extension of summer, with temperatures frequently hovering in the pleasant 70s. October: The Month of Transformation October serves as the definitive answer to the question of when the cold begins to assert itself.
The Arrival of Sustained Winter Cold November marks the point of no return, where the cold is no longer an occasional visitor but the permanent resident of the city. Month Average High (°F) Average Low (°F) Condition September 75 58 Mild October 58 38 Cold November 44 31 Freezing December 34 21 Winter.
Recognizing the Subtle Shift: Signs Chicago's Cold Weather Transition Is Beginning
It is during late September and early October that the subtle shift occurs, marked by shorter days and a distinct crispness in the morning air. The city sits where prairie meets lake, a geography that dictates the pace of the seasons.
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