Chicago, IL
Weather Forecast Office
Normals and Records
| First Freeze Normals | ||
| Normal First Autumn 32° or Lower | First Freeze Date Last Year (2025) | |
| Chicago (O'Hare) | October 19 | November 9 (26°) |
| Rockford | October 13 | October 23 (30°) |
Normals are based on 1991-2020 data.
| First Freeze Records | ||
| Earliest First Autumn 32° or Lower | Latest First Autumn 32° or Lower | |
| Chicago | September 22, 1995 (32°) | November 24, 1931 (30°) |
| Rockford | September 13, 1975 (32°) | November 11, 2016 (32°) |
History of the Chicago and Rockford Weather Observation Sites.
This Autumn's Temperatures
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Chicago, IL
250 George J Michas Dr.
Romeoville, IL 60446
815-834-1435 8am-8pm
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