Two things stack up on Westover's older housing stock. First, the age: a door installed when the house was built in 1957 has had a lot of winters to work through original hardware, and steel panels from that period corrode differently than the galvanized stock used since. Second, the climate: this area sits in a cold, severe band, and freeze-thaw cycles work at seams and dents all winter, widening a small crack into a panel that won't seal.
We also see plow and salt damage on ground-level panels more than anything else - road crews clearing the two-mile stretch back toward Morgantown throw salt and slush that sits against the bottom panel of doors facing the street. Combine that with steel that's approaching seventy years old on some of these houses and you get panels that look fine until spring, when the rust finally shows through the paint. It's not dramatic, it's just age plus weather doing what age plus weather does.