Researching openings (hotels/tourist sites/mountain access/glacial access) during this time frame is hit and miss, does anyone have information or a link where I can access the information?
Andrew,
You’ll find the information you seek here:
Chamonix.com
Make sure you’re familiar with the symptoms of altitude sickness if you’re planning to go up to the Aiguille du Midi.
Enjoy your trip!
Edited to add:
Here’s another helpful link: Chamonet.com
Thank you!
I chose to go mid-September for the best chance of clear weather. It snowed the first day I was there but was beautiful the next. The only bad thing was all the higher elevation trails were closed because of the new snow.
Weather generally degenerates as you get into October. I'd try to go in September.