I was told the weather "typically" changes the 3rd week in Sept. For me, I am 2 for 2 in seeing that happen, right on schedule.
In 2006, the day before our MR climb, the winds were >60 mph on the ridges, so no matter what the temp, it was a no go. We waited a day. Beautiful: No wind, 20 F.
Mountaineering, like farming, sailing, and all our most interesting activities, is a chancy business ruled largely by the weather.
HW Tilman, Everest 1938 page 502
