We had a full blown discussion about that recently. Someone complained that his cigars didn't taste right after being stored in cold temperatures. We didn't come to any conclusion if memory serves me correct. One thing that WILL speed up the aging process is lower humidity. It stands to reason that proper humidity, i.e., 65-70% will definitely stabilize it, and perhaps higher humidity might retard the aging process. Of course, in the presence of higher humidity levels such as 70-75%, you are risking beetles.
It would be interesting for everyone to "sacrifice" five or ten cigars from their collection to be separated and stored at lower temperature levels to do a study, but I don't know if any of us can afford that.