Cable failure in this area tracks pretty directly to two things: how old the door hardware is and how cold it gets. Most of the houses across the 64 named areas in this service territory went up in the 1960s and 70s, with the broader housing stock spanning 1938 to 1994. That means a lot of original torsion and extension hardware is still in service, cables included, well past the point where the galvanized coating has worn thin and started to rust from the inside of the strand out.
The climate here is the other half of it. This is a cold-moderate band, and cable steel gets less flexible in low temperatures. A cable that's already frayed can hold on through a mild fall and then let go on the first hard cold snap, because the strands that were still gripping lose what little give they had left. That's why cable calls cluster in cold weather even though the wear itself built up all year.
We see this pattern across the whole area we cover, not just one type of house. Older hardware plus cold snaps is a combination that doesn't care what decade your siding is.