These new finds at Chiquihuite Cave, located almost 9,000 feet above sea level and about 400 miles northwest of Mexico City...
So what were climatic conditions then?
Did elevations over a mile high not have glaciers? How cold would this height be in the middle of the last glaciation?
According to a GREAT book I have After the Ice: a global human history, 20.000–5.000 BC:
(you all should buy it!)
...[the] growth of ice sheets commenced 33,000 years ago and maximum coverage was between 26,500 years and 19–20,000 years ago, when deglaciation commenced in the Northern Hemisphere...
It is hard to find information on the specific Ice Age climate in Mexico...I found this on quora, however:
Just north of Mexico city at the same elevation is Atotonilco de Tula (altitude of 6,634 ft.), where they just unearthed a large trove of fossils. Sounds pretty cold to me, maybe even as cold the climate of present day Nova Scotia, Canada — some snow but not many swings in temperature in the former due to the southern exposure to sun and subtropics and the latter presently due to the ocean influence. But drier with the inland location.
“including mastodons, mammoths, camels, horses, deer and glyptodons, the armadillo's ancestor. Some bones may belong to bison, while others have not been identified.”
It actually sounds pretty nice, with lots of food to hunt.