This is the month where the "Chicago cold" differentiates itself from the dry cold of the plains, feeling damp and penetrating to the bone. The vibrant colors of the fall foliage provide a stunning backdrop to this transition, but the underlying message is clear: winter is marching toward the doorstep.
First Frost Typically Arrives in Mid-to-Late October
Month Average High (°F) Average Low (°F) Condition September 75 58 Mild October 58 38 Cold November 44 31 Freezing December 34 21 Winter. By December, the ground is often frozen, and the lake effect is in full swing.
However, the first whispers of change arrive with the clarity of the autumnal equinox. Daytime highs typically fall into the 50s, and overnight lows regularly dip near or below freezing.
Typical First Frost Timeline in October
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. First frosts usually appear mid-to-late October, impacting the urban canopy and gardens.
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