Housing in this service area mostly went up between 1938 and 1994, with the median build year around 1963, and the bulk of it is 1960s-70s stock. That matters for springs specifically: a torsion spring on a garage built in that window has usually been cycled tens of thousands of times on hardware that was never upgraded, just repainted or reused when the door itself got swapped out. The spring is rated for a number of cycles, and once a house is pushing sixty years old, most original springs are well past that number even if nobody's touched them.
Cold is the other half of it. This area sits in a moderate-cold climate band, and steel spring wire gets brittle and loses tension faster through repeated winter cold than it would somewhere mild. A spring that's already near the end of its cycle life is more likely to snap on a cold January morning than in July, because the metal is stiffer and the door is heavier to lift when everything's contracted. That combination - old original hardware plus a real winter - is why spring failure calls cluster the way they do across the towns we cover, not just here.