Please correct if wrong, but from a purely climo POV high impact all ZR events at DCL are more rare than locations where CAD is climatologically favored. Meaning, 9/10 times I see ZR in the zones for Garrett, it turns out to be PL/SN or nothing at all.
Noting these things seem to occur as a seasonal trend, and pointing out there was 24 hours of ZR / freezing fog at DCL just this past weekend (forecast verified), and it was anything but a high impact event there (WWA maybe didn't entirely verify). That said, it did get me wondering about all those depictions of mid level warm air being more than just a modeling anamoly vs. maybe a hint of a sesonal trend (hoping not).