These data represent monthly mean values of selected variables for ENSEMBLES (http://www.ensembles-eu.org). The list of output variables can be found in: http://ensembles.wdc-climate.de/output-variables. The model output was prepared for the ENSEMBLES Stream 2 experiment and comprises the HadCM3C run aebae (1/12/1999-1/01/2100). The model was initialised from the HadCM3C 20C3M run 1 using 1999 conditions. Although the model contains an interactive land/ocean carbon cycle, anthropogenic forcings (only) were prescribed to follow A1B scenario concentration values rather than emissions, i.e. prescribed changes in concentrations of: CO2, CH4, N2O, CFC11, CFC12, CFC113, HCFC22, Ozone. Sulphur-cycle emissions also provide a forcing input. No variations were made to solar radiation and volcanic aerosols. The output datasets are available in netCDF format. The dataset names are composed of - centre/model acronym (METO-HC) - scenario acronym (e.g. SRA2: SRES A2) - run number (e.g. 1: run 1) - time interval (MM:monthly mean, DM:daily mean, DC:diurnal cycle, 6H:6 hourly, 12h:12hourly) - variable acronym [with level value] (e.g. hur850: relative humidity, 850 hPa) --> example: METO-HC_20C3M_1_12H_hur850.