Planets like Jupiter can have a “surface” temperature below -200 degrees Fahrenheit. While brown dwarfs can have “surface” temperatures of about +400 degree Fahrenheit. Labeled a Y-Dwarf this new body which dose not orbit a star has a “surface” temperature of around +80 degrees Fahrenheit which is around room temperature.
The Y-Dwarves are not a lone several Jupiter-sized planets with out stars have been found. It all shows we have a lot to learn about the Universe.