I winter mine outside under a patio roof and, like you Danny, stop watering them completely late October/early November, even when it is still hot, it takes them a while to harden off for winter. Last winter (2015/16) most never went fully dormant though I still did not water them, this last winter most of them did - I kept them a little further from the heat leak that is our kitchen window (I am pretty sure they stick around 45F if in front of that window even on below freezing nights), so that may be it.
However, I also did an experiment - I put a big box store bought cheap Adenium Obesum (presumably a hybrid, but not sold as such) in the ground. To give it some protection I planted it in near a Tacoma stans and under the shade of my Palo Verde. Then the wet winter happened and I for sure thought I would find a rotted out carcass come spring, but surprise surprise, it survived, got a little bit of damage at the tallest stem tip, but did not even loose all of its leaves, now it is making branches and plenty of new leaves, and I am thinking I did not plant it in enough sun.
Now we only went down to 31F once this winter, that was it, so not very cold at all, but it was relatively speaking super wet - I lost a couple of cacti to that wetness - so in the right circumstances they can survive. The one big thing is that even in winter while we can get a lot of rain, we rarely have high humidity for very long, which I am sure is different for you Jkw.
Here is the in the ground experiment:
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