Data.gov provides one searchable interface to hundreds of federal, state, and local government agencies. Formats vary but include html, xls, cvs, txt, Esri REST, kmz, shapefile, and more.
The National Water and Climate Center as part of the National Resources Conservation Service (NRCS) provides data on water supply forecasts, soil climate analysis, snowpack, snowcourses, and general climate information. Most snow and reservoir data are from the western part of the United States of America and Canada. General climate information is available nationwide and some information is available in GIS compatible format.
Since 1940, the National Big Tree Program has been a testament to American Forests’ legacy of leadership in recognizing the beauty and critical ecosystem services provided by our biggest and oldest trees. More than 750 champions are crowned each year and documented in the biannual publication — the National Register of Big Trees.