Salt is the dominant Chicago factor
Cook County and the surrounding counties drop more road salt per winter than almost any region in the country. By year 8 most Chicago cars have visible undercarriage rust; by year 12 the rust is structural — rocker panels softening, brake lines corroding, frame rails pitted. State inspections don't catch all of it, but a lift inspection by a reputable mechanic usually does.
What this means for our pricing: Chicago cars get a small discount versus Sun Belt equivalents because more of the recoverable scrap is unusable steel. But the engine and transmission don't care about rust, so the drivetrain side of the offer stays normal. A 2012 Camry with a clean drivetrain pays well in Chicago even if the rocker panels are rotted — we don't double-penalize.
What we pay, and the cold-weather factors
Across recent Chicago purchases, payouts cluster about 5-10% below national medians on cars 8+ years old, mostly because of body-panel rust. Newer cars with intact catalytic converters and working drivetrains run on par with Sun Belt equivalents. Hybrids and trucks land at the top of the range; sedans with cut catalytic converters land at the bottom.
Cold-weather mechanical failures are the most common reason Chicago cars enter our pickup queue. Cracked engine blocks from improper coolant, dead alternators from cold-start stress, frozen brake calipers, transmission lines that gave out after a single bad winter — we see all of it. The car runs fine for ten years and then a single cold snap finishes it. We buy regardless.