We had -25C earlier this winter, it dropped a bit closer to 200km, again with a comfortable AC level.
So yeah, it drops a lot. We found we need at least 150km range for our car to be useful (we have an old Leaf with less for some time), and if things scale linearly we should still have about 175km effective winter range with 70% SOH.
Sure it's not winning any range contests, we knew that when we bought it.