Turbo-charge your search for free GIS data with this list of 10 free, downloadable global GIS datasets from highly reputable sources – vector and raster.
Natural Earth data is a free raster and vector (cultural and physical) data package containing the most common elements that you need to create a map.
The USGS Earth Explorer is quick and easy to download free Landsat imagery & other remote sensing data. Enter ROI, define timeline and download for free.
Some of the best GIS weather data available can be found at NWS, PRISM, MADIS and Weather Source. This GIS weather data dates back from past to present.