In reply to Smiffy:
Have been in Chamonix on and off for the past month. Freezing reached 4700m at one point, so yes this is a concern. We retreated off multiple routes during this time due to instability. That said, the freezing level will fluctuate, and just because it was high a week ago, doesn't mean it will be a high a week into the future.
For my part I'm keeping an eye on the weather and waiting for a cold spell. In the meantime I'm sticking to rock routes. Would recommend a similar strategy, but don't give up on the snow/mixed stuff entirely. All it takes is a couple of colder days to make them safer again.
