Anyways, yeah, concealed carry seems to have very little to do with this, weather was probably the main factor.
However, there has been at least one instance of a CCW holder stopping a crime, thus far: http://cdn.breitbart.com/Big-Government/2014/04/06/A-Whole-New-World-Chicago-Resident-With-CCW-Turns-Tables-On-Armed-Attackers