During the late fall/early winter is when the winter residents start showing up. As noted earlier, snow is possible and almost all evenings cool off in the mountains and high desert.
A couple of points of interest, one is the White Sands Missile Range in NM, I really wish we had time a couple of weeks ago when we were there to visit all the missile facilities. In the N/E corner is White Sands NP, it is awesome.
Another park is Carlsbad Caverns, I have wanted to go there since 3rd or 4th grade and finally made it this month. You will miss the bats as they are snowbirds too and will be back in MX by then, but the cavern is fantastic. The DW knew nothing about it other than it was a limestone cavern with some beautiful formations, she left in awe. I wasn't disappointed, and we plan on returning with our DGKs either Thanksgiving week or next spring. The Guadalupe mountains are very pretty and worth a visit.
In Arizona, don't miss Saguaro NP and Arizona-Sonora Desert Museum. In the park be sure and watch the movie at the visitors center. The road from the north into the park is listed as a dirt road, it is a dirt hwy. Wouldn't take the RV there but a good drive in a car.
Have fun and bundle up at night.
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II