The heatwave in late July was fierce, even at higher altitudes. Accordingly, I often chickened out of trails above the tree line and spent a good part of my 12-day trip through Switzerland and France on roads. But it was fun, even so. More here:
http://tours.farrent.de/?p=943Note: I was a little too heavy, because I though a framed pack might be more comfortable in the sunnier parts of France. That's not a choice I would repeat.