Okay, I am just dying to hear pastorfred's wise summary of the most recent chapter...
Fred? (I would imagine you've shared this in chat... share on the thread as well?)
Whoa, Kelly! It sounds to me like you have a pretty good handle on the most recent chapter, yourself, probably better than anything I could have to say.
Snow at the higher elevations of the northern rockies is not unusual any time of year, but it's to be expected in September. Warm, pleasant days are also a possibility. Ennis is clearly showing a lot of care and concern for Ellery, and as ever, wishing he had done more of that for Jack.
The chapter is an important transition between family time in Riverton and the time Ennis and Ellery will share on the sacred ground of Brokeback Mountain. Mother nature has given them a little more time to get ready, and my guess is that they need it. They will get up to the summit at the right time, and they will be ready for the experience they need to have there. It might be of interest to note that "summit" in this context means the highest place on a road or trail, not the highest peak.