We report data describing the temperature dependence of the critical supersaturation for methanol, ethanol, 1-propanol, and 2-propanol. The data obtained in this investigation came from two different thermal diffusion cloud chambers. A few data points were also included for comparison purposes from a literature report involving a third thermal diffusion cloud chamber (ref 22). Together, these data span temperature ranges of 150-160 K. The critical supersaturation data were obtained using either helium or hydrogen as the background gas. On the basis of our observations for the temperature ranges and the total pressure (1.013 bar) employed in this investigation, we find that the critical supersaturations for all of these alcohols when hydrogen is used as a background gas are either equal to or greater than those obtained when helium is used as the background gas. This behavior is consistent with observations reported in refs 18 and 23 resulting from studies in which the dependence of the critical supersaturation of these alcohols on the background gas was investigated and in which the critical supersaturation was found to depend on both the kind of background gas as well as the total pressure.