The North America climate data were derived from WorldClim (http://www.worldclim.org/), a set of global climate layers developed by the Museum of Vertebrate Zoology at the University of California, Berkeley, USA, in collaboration with The International Center for Tropical Agriculture (http://www.ciat.cgiar.org/Paginas/index.aspx) and Rainforest CRC (http://www.jcu.edu.au/rainforest/) with support from NatureServe (http://www.natureserve.org/). The global climate data layers were generated through interpolation of average monthly climate data from weather stations across North America. The result is a 30-arc-second-resolution (1-Km) grid of mean temperature values. The North American data were clipped from the global data and reprojected to the standard Lambert Azimuthal Equal Area projection used for the North American Environmental Atlas. The Monthly Precipitation data set consists of 12 raster files, one for each month, showing mean values derived from monthly precipitation readings. The source data covers the years 1950-2000; individual weather stations used to supply the source data may not have data available for all the years.
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