I hope this isn’t off gear topic, after writing the question, I wasn’t sure, but have no idea how to transfer this to another list so apologies if so: I’m usually a solo hiker, but I’m hiking the high peaks section of the JMT for the last part of August (19th-29th), with a group who intend to end hiking by 4pm daily–which means much more sitting around than actually moving. I usually pack for constant hike, mode–stripped down to sports bra/shorts/sneakers/hats/mittens–get up early, make camp late–and this is optimum temp. control At night I have a 15 degree wm down bag, frogg togg type jacket, light cashmere sweater and silk turtleneck–which, again–with socks, rain pants and hat, can keep me warm enough for most weather. But with ending early and sitting around, I’m flummoxed about what to bring on the JMT in August. Does anyone know what temperatures go down to, generally speaking, at 12-14,000 ft there? My only high peaks experience is on the Colorado Trail during monsoon season. Weather was not always comfortable (august monsoon) but it was never cold enough to be a problem. I’ve looked at the PCT sites, but can’t find any up to date temp. info. Should I be considering bringing my micropuff vest or pullover? Or anything else extra? When I move, I stay totally warm–when I stop, I freeze (low blood pressure and Reynauds) but it’s never been a problem when I’ve had complete control over my own hike–this time is going to be different and not knowing the group well, I want to be prepared.