Spatial coverage is good over most of the globe, particularly for the United States and Europe.
Data gaps are evident over the Amazon rainforest, the Sahara desert, Greenland, and Antarctica. Similarly, all major inhomogeneities have been flagged, although no homogeneity corrections were applied. Because of the size of the data base, the NDP is not available on floppy diskette. This package consists of a data base containing daily observations of maximum and minimum temperature and precipitation amounts at 138 U.S. stations. The data for each station extend through 1987, and most station records are complete for at least 80 years.