Performing a standardized measurement of ADC requires maintaining a phantom temperature of 0oC. To expand quality assurance of ADC measurement on a network of scanners at room temperatures, a model for temperature dependence was applied as a correction factor. A diffusion phantom was scanned on 1.5T and 3T scanners at four locations using sequence parameters from a prostate protocol. With temperature of the phantom measured at each acquisition, ADC measurements on identically configured scanners exhibited reduced variance when normalized to modeled values. The use of the temperature model is potentially useful in developing a QA program for ADC measurements.