Detailed LTE calculations were made of the sensitivities of some Fraunhofer lines to local variations of the effective temperature of the Sun, taking also into account the effects of local variations of the microturbulence. The temperature sensitivities show a clear dependence upon the mean optical depth at which lines originate and upon the binding energy of the lower level involved in the transition. A list of some selected lines is given, in view of possible measurements either of any pole equatorvariation of the effective temperature or of such local effects as those connected with the presence of strong nonspot magnetic fields. (auth)