Which cacti can survive winter weather--in the teens?
To answer this question, one would need to know which zone you are discussing. There are cactus and succulents that withstand very cold winter temps. Bear in mind that it isn't only temperature but moisture level that is important in whether or not a cactus or succulent is hardy. This link provides a partial list of cold hardy cactus and succulents: http://www.sci.fi/~cubase/hardycacti.html