In reply to UKC Articles:
I think i would disagree that the main summer alpine season starts in july (other than because of the school hollidays). June is very much peak summer season, and even by early july many 'summer' alpine routes can have passed out of condition thanks to the heatwaves of the last few years. Certainly by august the high mountains are falling down and anything other than the most well traveled stable rock route is out of the question most years! By september the permafrost can begin freezing up again enough that things can start to stabilise again, so assuming you can access the routes (think gaping bergschrunds and impassible crevasses!) then it can almost be considered a second summer season.
So the days of a traditional summer alpine season coinciding with the traditional summer holliday period are long gone in my opinion. Increasingly the 'summer' apline season is becoming may-june with a potential second comming in sept-oct!