Two things wear a garage door cable: cycles and cold. Sun Valley sees the same severe cold stretches as the rest of the service area, and cold makes galvanized cable stiffer and more prone to cracking right at the point where it bends around the drum - the same spot that takes the most flex on every open and close. Over a winter or two, that repeated stiff-bend action is what turns a sound cable into a frayed one.
Age plays into it too. With most doors in this area dating to the late 1980s through early 2000s, a lot of the original cable is thirty-plus years old and was never designed to last that long regardless of the weather. If your door hasn't had the cables replaced since it was installed, cold winters have had a long run at them.
We don't see much cable failure from use alone - a door that's opened and closed normally doesn't wear a cable out fast. It's almost always the cold-stiffen-crack cycle combined with original-age hardware that brings people to call.