AChile: Patagonia in Winter: Is it a good idea?
The problem in july is the rain not only the cold . And the Torres del Paine that is beautiful its a pity to loose them with clouds. Maybe the Atacama Desert at San Pedro De Atacama in the north is bettter
ASan Pedro De Atacama: Favorite activities in Atacama Desert, Chile?
You must visit the Geisers del tatio, The Valle de la Luna and Laguna Cejar. Its a good idea renting a car.