Sparks sits in a cold-climate band severe enough that steel springs and nylon rollers both get stiff before the sun's up. Cold steel is less elastic, so a spring already near the end of its rated cycles is more likely to snap on a frigid morning than on a mild afternoon - the metal just has less give left in it. Grease in the torsion bar bearings thickens in the cold too, which adds drag the opener has to fight every time it lifts the door, and that extra strain is often what finally breaks a weak cable or strips an old gear.
Housing age compounds it. The five main pockets of stock across the area date mostly from the 1980s and 90s, which means a lot of garages still running original galvanized torsion springs and first-generation chain-drive openers. None of that hardware was built to last forever, and a 30-plus-year-old spring doesn't care that it was fine last winter. We see the same failure pattern on house after house from that era: the spring that held up through two decades of mild mornings finally lets go the first week it drops hard overnight.