Not everything belongs in a climate-controlled unit, but some items genuinely cannot survive without one. The problem is that the items most likely to get damaged in storage are often the ones people least expect to be at risk.
Jamestown, ND, can drop to -30 degrees Fahrenheit. By July, temperatures can climb past 95 degrees. That is a swing of more than 125 degrees over the course of a year, and every degree of that range affects what you keep in storage.