United States Cloudiness, Mean Number of Days (Clear, Partly Cloudy, Cloudy) is a point theme representing the mean number of cloudy days as measured at weather stations throughout the United States, Puerto Rico, and Pacific Islands.
Creator:
National Climatic Data Center (U.S.), United States. National Environmental Satellite, Data, and Information Service, United States. National Oceanic and Atmospheric Administration., and Digital Social Science Centaer, Columbia University Libraries