NOAA National Centers for Environmental Information (NCEI)The place to go if you need climate data, including precipitation, temperature, bathymetry, geomagnetic data, solar events, geophysics, and natural hazards, and other measures. You can get yearly and monthly averages, search for data at particular locations, as well as get Global and U.S. Annual Climate reports. Data is sorted by method collected (i.e. weather balloon, marine and ocean, satellite, radar, etc.). [Formerly called the National Climate Data Center (NCDC)]