There either is a need to achieve a condition when a threat is identified or there is no threat, hence no condition to achieve. I set and achieve a readiness condition when I feel there is a need to increase readiness.

HurCon 5 is normally set from 01Jun thru 01Dec because that is the "Hurricane Season".

If I were in an Earthquake prone area, I would always be in a readiness condition that would be appropriate for the amount of shakes that are normally occurring. That would be a tough call to make, at any rate.