The wind off the lake loses its playful nature and becomes a cutting force, slicing through light jackets. 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.
Understanding the Chicago Wind Chill Factor
However, the first whispers of change arrive with the clarity of the autumnal equinox. Snow becomes a regular, if not constant, possibility, turning the city into a landscape of white and grey.
Daytime highs typically fall into the 50s, and overnight lows regularly dip near or below freezing. Month Average High (°F) Average Low (°F) Condition September 75 58 Mild October 58 38 Cold November 44 31 Freezing December 34 21 Winter.
Understanding the Wind Chill Factor in Chicago's Cold Weather
The city sits where prairie meets lake, a geography that dictates the pace of the seasons. While the start of the month might still allow for light sweaters, the second half of October tells a different story.
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