What are ranges of cold and warm colors (http://www.diy-bathroom-remodel.com/images/color_wheel.gif) in RGB?
already answered but need to add this:
If you are interested in physical temperature and color dependencies then this is the scale you are looking for:

It is the color of light emitting from blackbody of given temperature. In astronomy is this used for star color classification (like BV color index).
It also can be used for indirect temperature measurements.