The rut is triggered by "hours of daylight" and happens the same time each year accordingly. There are numerous sources for that online and most books on whitetail.
What "we see" differs simply because (IMHO) the weather plays a big part as does the moon phases and probably other things as well (herd numbers etc). Some years it seems to be hammered all into a few days, other years spread out going by our views of deer moving/rutting.
Cold snaps, high winds that carries scent further/faster (oh yes) all seem to have me viewing higher buck movement most days and those days I will NOT miss unless Ive no choice.
Extemely dry falls seems to lower some activity concentrations too. Moisture in the air is needed for their sense of smell to go into hyper drive IMO. Might just be a fluke on my sightings but seems to be a pattern.
ALSO, IMHO...what WE call "the rut" being the most activity is actually the PRE rut when bucks are out and about and I agree with the time frame of it being the first 10 days or so of Nov at least for IN.
When they are actually rutting and WITH does, I see enormously lower numbers of bucks and hunt the heavy cover edges hoping to catch a big boy following the doe out in the wee hours.
Another thing Ive found is when the rut IS IN, sightings of many YOUNG bucks out running their butts of "trying" is pretty common. The big boys got the girls locked up if IN heat.
Those does coming into it late or again or whatever will have a half dozen young ones after her.
Big Daddy shows?........game over.
2 cents
God Bless
PS......a short addition if you would allow please.
TOO MANY, again ONLY my opinion, "worry" about the rut and spend a multitude of hours trying to decode it yet remember, that bucks are out there regardless and while you may SEE more during the prerut and it's pretty exciting, that same buck was there ......somewhere and much more easily patterned in times previous to the rut. FINDING HIM is the trick and worth the effort.
Once he goes into his nose to the ground, gotta find the girls mode........he may very well be gone or moving too fast for shots.
I hunt all the "phases" of the season, love the prerut and rut but most my efforts are spent finding and decoding a bucks movement prior to that and when he starts moving more, youre there.
Worked great last year.....except I m m mmmmissed.