In reply to asdf123:
I'd agree with the other posters above, and add a few points:
- Octobers can always be affected by a late monsoon, and occasionally by a large dump of snow, and this has been the case for decades (at least)
- too much 'good' weather renders some routes too dry, not enough ice for climbing, so it depends on your route
- the high winds of late November and early December above 7000m can sometimes start in mid-October and affect summit days at 6500m
- last October (2017) in the Khumbu was perfect right through November and many routes got done, whereas the previous couple of Octobers it was too dry for some routes
- at the same time last year, the weather in the Annapurna-Dhaulagiri area was much less settled, and had some rain and snow.
- and at the same time in the Manaslu region, 500 people summited Manaslu in weeks of perfect weather, but that weather rendered lower mountains dangerously dry with stonefall
- Sept-Oct 2013 was very clear and 8000ers were summited late Sept but then a big dump of snow second week of October ruined things for two weeks, then it was good again through Nov. This pattern has happened a few times in the last decade.
- the Khumbu in Oct-Nov is now very busy, and this will affect things like flights, accommodation, prices, helicopter rescues, itinerary changes etc that all impact an expedition there
- Ama Dablam is fixed ropes all the way, so many of the regular factors don't apply so much, as you're not routefinding, climbing and protecting like a normal climb - but your tactics and progress will be affected by crowding issues. Baruntse usually needs a strong/Sherpa team to climb the upper ridge or most teams won't get up it, and is more prone to avalanche than Ama Dablam etc and is a much more serious approach/retreat.