Various global climate model runs at several institutions were made in the 1980s to assess the impact of increasing levels of atmospheric CO2 on the global climate. The Data Support Section at NCAR assembled and/or computed the 10-year monthly climatologies from the outputs of these runs and made them available in a common ASCII exchange format. The standard parameters that were provided by all of the models are surface temperature, wind speed, precipitation, humidity, incoming solar radiation, and pressure (sea-level or surface). Other parameters were provided and they varied depending on the individual model. These models also provided outputs in various timesteps other than decadal means, and those outputs are archived by institution in the ds318.1 through ds318.5 series of datasets.