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Unsure if you still need this data but a great resource for annual climate data is directly through NASA/USGS data repositories. Beyond that NCAR holds a large amount of gridded environmental data, specifically for climate/bioclimate. For specifically climate observations, you might be better off with HadCRU data. Both data sets are compatible with GIS ...


Use the spatial analysts PLUS tool to add 0.3 or 0.8 to your climate grid. If you read the help file (syntax section) the second grid which you add to your input grid can actually be a constant and not just another grid. So putting 0.3 into that will add 0.3 to all the cells in your input raster.

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