Navigating the Winter Threshold December solidifies the coldest period of the year, though the absolute coldest temperatures often arrive in January. Chicagoans learn to respect the calendar with a unique blend of optimism and preparation.
Chicago Winter Arrival: November Timeline and What to Expect
While the start of the month might still allow for light sweaters, the second half of October tells a different story. Daytime highs typically fall into the 50s, and overnight lows regularly dip near or below freezing.
By December, the ground is often frozen, and the lake effect is in full swing. Average high temperatures drop from 70°F early in the month to 50°F by Halloween.
Chicago Winter Arrival: November Timeline and What to Expect
First frosts usually appear mid-to-late October, impacting the urban canopy and gardens. The city sits where prairie meets lake, a geography that dictates the pace of the seasons.
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