This document presents the results of an evaluation of climate data from Modern-Era Retrospective Analysis for Research and Applications (MERRA) for use in the Long Term Pavement Performance (LTPP) Program and for other infrastructure applications. MERRA data were compared against the best available ground-based observations both statistically and in terms of effects on pavement performance as predicted using the Mechanistic-Empirical Pavement Design Guide (MEPDG). These analyses included a systematic quantitative evaluation of the sensitivity of MEPDG performance predictions to variations in fundamental climate parameters.