Snow has already come and gone here on the Olympic Peninsula; but not before I had to spend a day removing ice dams from almost entire runs of the totally inappropriate California-style gutters on my late parents' house, which was built in 1974. The separate shop, built more than a decade later, has conventional metal gutters not subject to the same problem.
I usually remember to clean or at least inspect gutters and downspouts in late Fall for leaves, conifer needles and cones, moss clumps and such. However, because the conditions are uncommon, I only think about the ice dams on the house when I step out the back door and into the drizzle of water flowing over the roof edge.
I feel for Texans because they're simply not equipped to deal with that kind of snow. And why would they be? Here in Calgary, we set a daily snowfall record. The day with the single greatest dump of snow we ever had was not in December, not in January, not in February, not in March. Nope, we set the record in early September, during the summer!