This data set is a subset of the Madden-Julian Oscillation (MJO) Task Force & Year of Tropical Convection (YOTC) and the GEWEX Atmosphere System Study (GASS) 20-year climate model simulation data. There are 25 folders that represent the 25 climate model simulations produced by 23 models (three simulations use the same model) from different organizations. The relationships between the simulations are detailed with associated references.