Systematic experiments were conducted on the temperature distribution along the stack in a simulated acoustic-resonance tube refrigerator under various system parameters, as a step of research works to construct fundamental basis for the reliable theory of thermoacoustic refrigerators. The measured temperature distributions were classified into five patterns for reference and were compared with the existing linearized theory. Both measured distribution pattern and discrepancy between the theory and experiments were closely related to Strouhal and Peclet numbers, which have close relationship to forced convection heat transfer. In particular, Strouhal number had a dominant influence on the temperature distribution, and small strouhal number gave good agreement between the theory and experiments. Thus these dimentionless numbers had a high potential for the improvement of the existing theory.