Chicago, Illinois – Arctic air is expected to remain firmly entrenched across northern Illinois from Jan. 24 through Jan. 30, bringing a prolonged stretch of below-normal temperatures and reinforcing persistent mid-winter conditions across the region.
According to the National Weather Service Climate Prediction Center, northern Illinois falls within a roughly 70 percent probability zone for below-normal temperatures during the Jan. 24–30 period. Confidence remains elevated that cold air will dominate with limited opportunities for sustained warming before the end of the month.
Across the Chicago metro area and surrounding counties, daytime highs are expected to run well below seasonal averages, with overnight lows frequently dropping into the teens and single digits. Persistent cold will allow snow and ice to linger on roadways such as Interstates 90, 94, 290, and 80, particularly on bridges, ramps, and untreated surfaces during overnight and early morning hours.
Farther west and north, including Rockford, DeKalb, and communities along the I-39 corridor, temperatures are also expected to stay below normal throughout the Jan. 24–30 window. Even brief moderation periods may struggle to push highs out of the 20s, increasing the risk for refreezing and slick travel conditions.
The Illinois Department of Transportation urges drivers to remain cautious during early morning and nighttime travel and to allow extra time during commutes. Residents are encouraged to protect exposed pipes, limit prolonged outdoor exposure, and check on vulnerable neighbors and pets.
The Arctic pattern shows little indication of breaking before the calendar turns, and additional cold-related advisories may be issued as confidence remains high in sustained below-normal temperatures across northern Illinois through Jan. 30.
