For a science project, I was looking for a bacteria that would last on surfaces for a long time, in low humidity, relatively lower temperatures (20-40 degrees Fahrenheit), low pressure (5000 feet elevation), and less oxygen. Do you know of any bacteria that will survive and thrive under conditions similar the the ones aforementioned?

Arqueobacterias the oldest bacteria that survive this things but those are hard to find

Tardigrades can survive in the space but they are eukaryotes

I have never heard of that species. But certain Actinobacteria and Chloroflexi have been found in desert soil. But there are also other common soil bacteria, such as rhizobia oar Arthrobacters that have successful members surviving in arid areas.

Generally I would start looking at soil bacteria (as they are typically very tough bastards to begin with) and go from there.